diff --git a/metis_l1_prep.pro b/metis_l1_prep.pro
index c48a8496846dc0402a2611e3d9893bc8d6a2d24f..32e26ec625164b726a542cae7e2974f83d8c8b03 100755
--- a/metis_l1_prep.pro
+++ b/metis_l1_prep.pro
@@ -270,56 +270,56 @@ pro metis_l1_prep
 	; adjust the primary header (it is almost the same for all data product types)
 
 	fxaddpar, primary_header, 'FILENAME', file_name
-	fxaddpar, primary_header, 'PARENT', file_basename(input.file_name), 'Name of the parent file', before = 'APID'
-	fxaddpar, primary_header, 'DATE', date, 'Date and time of FITS file creation', before = 'OBT_BEG'
-	fxaddpar, primary_header, 'DATE-OBS', date_beg, 'Same as DATE-BEG', before = 'OBT_BEG'
-	fxaddpar, primary_header, 'DATE-BEG', date_beg, 'Start time of observation', before = 'OBT_BEG'
-	fxaddpar, primary_header, 'DATE-AVG', date_avg, 'Average time of observation', before = 'OBT_BEG'
-	fxaddpar, primary_header, 'DATE-END', date_end, 'End time of observation', before = 'OBT_BEG'
-	fxaddpar, primary_header, 'TIMESYS', 'UTC', 'System used for time keywords', before = 'OBT_BEG'
-	fxaddpar, primary_header, 'TIMRDER', 0.0, '[s] Estimated random error in time values', before = 'OBT_BEG'
-	fxaddpar, primary_header, 'TIMSYER', 0.0, '[s] Estimated systematic error in time values', before = 'OBT_BEG'
+	fxaddpar, primary_header, 'PARENT', file_basename(input.file_name), 'name of the parent file', before = 'APID'
+	fxaddpar, primary_header, 'DATE', date, 'date and time of FITS file creation', before = 'OBT_BEG'
+	fxaddpar, primary_header, 'DATE-OBS', date_beg, 'same as DATE-BEG', before = 'OBT_BEG'
+	fxaddpar, primary_header, 'DATE-BEG', date_beg, 'start time of observation', before = 'OBT_BEG'
+	fxaddpar, primary_header, 'DATE-AVG', date_avg, 'average time of observation', before = 'OBT_BEG'
+	fxaddpar, primary_header, 'DATE-END', date_end, 'end time of observation', before = 'OBT_BEG'
+	fxaddpar, primary_header, 'TIMESYS', 'UTC', 'system used for time keywords', before = 'OBT_BEG'
+	fxaddpar, primary_header, 'TIMRDER', 0.0, '[s] estimated random error in time values', before = 'OBT_BEG'
+	fxaddpar, primary_header, 'TIMSYER', 0.0, '[s] estimated systematic error in time values', before = 'OBT_BEG'
 	fxaddpar, primary_header, 'LEVEL', 'L1'
 	fxaddpar, primary_header, 'CREATOR', 'metis_l1_prep.pro'
 	fxaddpar, primary_header, 'VERS_SW', input.sw_version
-	fxaddpar, primary_header, 'VERS_CAL', cal_pack.version, 'Version of the calibration package', after = 'VERS_SW'
+	fxaddpar, primary_header, 'VERS_CAL', cal_pack.version, 'version of the calibration package', after = 'VERS_SW'
 	fxaddpar, primary_header, 'VERSION', version
-	fxaddpar, primary_header, 'OBSRVTRY', 'Solar Orbiter', 'Satellite name', before = 'INSTRUME'
-	fxaddpar, primary_header, 'TELESCOP', telescope, 'Telescope that took the measurement', before = 'INSTRUME'
-	fxaddpar, primary_header, 'DETECTOR', detector, 'Subunit/sensor', before = 'DATAMIN'
-	fxaddpar, primary_header, 'OBJECT', 'TBD', 'The use of the keyword OBJECT is [TBD]', before = 'DATAMIN'
-	fxaddpar, primary_header, 'OBS_MODE', planning_data.obs_mode, 'Observation mode', before = 'DATAMIN'
-	fxaddpar, primary_header, 'OBS_TYPE', obs_type, 'Encoded version of OBS_MODE', before = 'DATAMIN'
-	fxaddpar, primary_header, 'FILTER', filter, 'Filter used to acquire this image', before = 'DATAMIN'
-	fxaddpar, primary_header, 'WAVELNTH', wavelnth, '[nm] Characteristic wavelength of observation', before = 'DATAMIN'
-	fxaddpar, primary_header, 'WAVEMIN', wavemin, '[nm] Min. bandpass wavelength', before = 'DATAMIN'
-	fxaddpar, primary_header, 'WAVEMAX', wavemax, '[nm] Max. bandpass wavelength', before = 'DATAMIN'
-	fxaddpar, primary_header, 'WAVEBAND', waveband, 'Bandpass description', before = 'DATAMIN'
-	fxaddpar, primary_header, 'XPOSURE', xposure, '[s] Total effective exposure time', before = 'DATAMIN'
-	fxaddpar, primary_header, 'NSUMEXP', nsumexp, 'Number of detector readouts summed together', before = 'DATAMIN'
-	fxaddpar, primary_header, 'TELAPSE', telapse, '[s] Elapsed time during observation', before = 'DATAMIN'
-	fxaddpar, primary_header, 'SOOPNAME', planning_data.soop_name, 'Name of the SOOP that the data belong to', before = 'DATAMIN'
-	fxaddpar, primary_header, 'SOOPTYPE', soop_type, 'Campaign ID(s) that the data belong to', before = 'DATAMIN'
-	fxaddpar, primary_header, 'OBS_ID', planning_data.obs_id, 'Unique ID of the individual observation', before = 'DATAMIN'
-	fxaddpar, primary_header, 'TARGET', 'TBD', 'Type of target from planning', before = 'DATAMIN'
-	fxaddpar, primary_header, 'BSCALE', 1, 'Ratio of physical to array value at 0 offset', before = 'DATAMIN'
-	fxaddpar, primary_header, 'BZERO', 0, 'Physical value for the array value 0', before = 'DATAMIN'
-	fxaddpar, primary_header, 'BTYPE', metis_datatype[datatype], 'Science data object type', before = 'DATAMIN'
-	fxaddpar, primary_header, 'BUNIT', 'DN', 'Units of physical value', before = 'DATAMIN'
-	fxaddpar, primary_header, 'BLANK', 0, 'Data value used to mark undefined pixels', after = 'BUNIT'
+	fxaddpar, primary_header, 'OBSRVTRY', 'Solar Orbiter', 'satellite name', before = 'INSTRUME'
+	fxaddpar, primary_header, 'TELESCOP', telescope, 'telescope that took the measurement', before = 'INSTRUME'
+	fxaddpar, primary_header, 'DETECTOR', detector, 'subunit/sensor', before = 'DATAMIN'
+	fxaddpar, primary_header, 'OBJECT', 'TBD', 'the use of the keyword OBJECT is [TBD]', before = 'DATAMIN'
+	fxaddpar, primary_header, 'OBS_MODE', planning_data.obs_mode, 'observation mode', before = 'DATAMIN'
+	fxaddpar, primary_header, 'OBS_TYPE', obs_type, 'encoded version of OBS_MODE', before = 'DATAMIN'
+	fxaddpar, primary_header, 'FILTER', filter, 'filter used to acquire this image', before = 'DATAMIN'
+	fxaddpar, primary_header, 'WAVELNTH', wavelnth, '[nm] characteristic wavelength of observation', before = 'DATAMIN'
+	fxaddpar, primary_header, 'WAVEMIN', wavemin, '[nm] min. bandpass wavelength', before = 'DATAMIN'
+	fxaddpar, primary_header, 'WAVEMAX', wavemax, '[nm] max. bandpass wavelength', before = 'DATAMIN'
+	fxaddpar, primary_header, 'WAVEBAND', waveband, 'bandpass description', before = 'DATAMIN'
+	fxaddpar, primary_header, 'XPOSURE', xposure, '[s] total effective exposure time', before = 'DATAMIN'
+	fxaddpar, primary_header, 'NSUMEXP', nsumexp, 'number of detector readouts summed together', before = 'DATAMIN'
+	fxaddpar, primary_header, 'TELAPSE', telapse, '[s] elapsed time during observation', before = 'DATAMIN'
+	fxaddpar, primary_header, 'SOOPNAME', planning_data.soop_name, 'name of the SOOP that the data belong to', before = 'DATAMIN'
+	fxaddpar, primary_header, 'SOOPTYPE', soop_type, 'campaign ID(s) that the data belong to', before = 'DATAMIN'
+	fxaddpar, primary_header, 'OBS_ID', planning_data.obs_id, 'unique ID of the individual observation', before = 'DATAMIN'
+	fxaddpar, primary_header, 'TARGET', 'TBD', 'type of target from planning', before = 'DATAMIN'
+	fxaddpar, primary_header, 'BSCALE', 1, 'ratio of physical to array value at 0 offset', before = 'DATAMIN'
+	fxaddpar, primary_header, 'BZERO', 0, 'physical value for the array value 0', before = 'DATAMIN'
+	fxaddpar, primary_header, 'BTYPE', metis_datatype[datatype], 'science data object type', before = 'DATAMIN'
+	fxaddpar, primary_header, 'BUNIT', 'DN', 'units of physical value', before = 'DATAMIN'
+	fxaddpar, primary_header, 'BLANK', 0, 'data value used to mark undefined pixels', after = 'BUNIT'
 	fxaddpar, primary_header, 'DATAMIN', min(data, /nan)
 	fxaddpar, primary_header, 'DATAMAX', max(data, /nan)
 	fxaddpar, primary_header, 'IDB_VERS', input.idb_version, '', before = 'HDR_VERS'
-	fxaddpar, primary_header, 'INFO_URL', 'http://metis.oato.inaf.it', 'Link to more information on the instrument', before = 'HISTORY'
+	fxaddpar, primary_header, 'INFO_URL', 'http://metis.oato.inaf.it', 'link to more information on the instrument', before = 'HISTORY'
 
 	if datatype le 6 then begin
-		fxaddpar, primary_header, 'NBIN1', bin_fact, 'Binning factor in the dimension 1', before = 'COMPRESS'
-		fxaddpar, primary_header, 'NBIN2', bin_fact, 'Binning factor in the dimension 2', before = 'COMPRESS'
-		fxaddpar, primary_header, 'NBIN', bin_fact * bin_fact, 'Product of all NBIN values above', before = 'COMPRESS'
-		fxaddpar, primary_header, 'PXBEG1', 1, 'First pixel read out in dimension 1', before = 'COMPRESS'
-		fxaddpar, primary_header, 'PXBEG2', 1, 'First pixel read out in dimension 2', before = 'COMPRESS'
-		fxaddpar, primary_header, 'PXEND1', naxis1, 'Last pixel read out in dimension 1', before = 'COMPRESS'
-		fxaddpar, primary_header, 'PXEND2', naxis2, 'Last pixel read out in dimension 2', before = 'COMPRESS'
+		fxaddpar, primary_header, 'NBIN1', bin_fact, 'binning factor in the dimension 1', before = 'COMPRESS'
+		fxaddpar, primary_header, 'NBIN2', bin_fact, 'binning factor in the dimension 2', before = 'COMPRESS'
+		fxaddpar, primary_header, 'NBIN', bin_fact * bin_fact, 'product of all NBIN values above', before = 'COMPRESS'
+		fxaddpar, primary_header, 'PXBEG1', 1, 'first pixel read out in dimension 1', before = 'COMPRESS'
+		fxaddpar, primary_header, 'PXBEG2', 1, 'first pixel read out in dimension 2', before = 'COMPRESS'
+		fxaddpar, primary_header, 'PXEND1', naxis1, 'last pixel read out in dimension 1', before = 'COMPRESS'
+		fxaddpar, primary_header, 'PXEND2', naxis2, 'last pixel read out in dimension 2', before = 'COMPRESS'
 	endif
 
 	; read the house-keeping telemetry
@@ -498,9 +498,9 @@ pro metis_l1_prep
 
 	if datatype le 6 and isa(quality_matrix) then begin
 		quality_matrix_header = !null
-		fxaddpar, quality_matrix_header, 'PCOUNT', 0, 'Parameter count'
-		fxaddpar, quality_matrix_header, 'GCOUNT', 1, 'Group count'
-		fxaddpar, quality_matrix_header, 'EXTNAME', 'Quality matrix', 'Extension name'
+		fxaddpar, quality_matrix_header, 'PCOUNT', 0, 'parameter count'
+		fxaddpar, quality_matrix_header, 'GCOUNT', 1, 'group count'
+		fxaddpar, quality_matrix_header, 'EXTNAME', 'Quality matrix', 'extension name'
 		fits_add_checksum, quality_matrix_header, quality_matrix
 		mwrfits, quality_matrix, out_file_name, quality_matrix_header, /no_comment, /silent
 
@@ -510,9 +510,9 @@ pro metis_l1_prep
 	; build the telemetry extension
 
 	hk_extension_header = !null
-	fxaddpar, hk_extension_header, 'PCOUNT', 0, 'Parameter count'
-	fxaddpar, hk_extension_header, 'GCOUNT', 1, 'Group count'
-	fxaddpar, hk_extension_header, 'EXTNAME', 'House-keeping', 'Extension name'
+	fxaddpar, hk_extension_header, 'PCOUNT', 0, 'parameter count'
+	fxaddpar, hk_extension_header, 'GCOUNT', 1, 'group count'
+	fxaddpar, hk_extension_header, 'EXTNAME', 'House-keeping', 'extension name'
 
 	hk_bin_table = make_bin_table(hk_table)
 	mwrfits, hk_bin_table, out_file_name, hk_extension_header, /no_comment, /silent
diff --git a/metis_wcs.pro b/metis_wcs.pro
index 1a4b6564d8b7196242fcca1c699200d90b820f6e..9570e289a4cc0a79cce381154cd1822a310a1818 100644
--- a/metis_wcs.pro
+++ b/metis_wcs.pro
@@ -108,23 +108,23 @@ function metis_wcs, header, cal_pack, ref_detector = ref_detector
 	wcs.add, { $
 		name: 'WCSNAME', $
 		value: 'Helioprojective-Cartesian', $
-		comment: 'Name of coordinate system'}
+		comment: 'name of coordinate system'}
 	wcs.add, { $
 		name: 'CTYPE1', $
 		value: ctype1, $
-		comment: ctype1 eq 'HPLT-TAN' ? 'Helioprojective latitude (Solar Y)' : 'Helioprojective longitude (Solar X)'}
+		comment: ctype1 eq 'HPLT-TAN' ? 'helioprojective latitude (solar y)' : 'helioprojective longitude (solar x)'}
 	wcs.add, { $
 		name: 'CTYPE2', $
 		value: ctype2, $
-		comment: ctype2 eq 'HPLT-TAN' ? 'Helioprojective latitude (Solar Y)' : 'Helioprojective longitude (Solar X)'}
+		comment: ctype2 eq 'HPLT-TAN' ? 'helioprojective latitude (solar y)' : 'helioprojective longitude (solar x)'}
 	wcs.add, { $
 		name: 'CUNIT1', $
 		value: 'arcsec', $
-		comment: 'Units along axis 1'}
+		comment: 'units along axis 1'}
 	wcs.add, { $
 		name: 'CUNIT2', $
 		value: 'arcsec', $
-		comment: 'Units along axis 2'}
+		comment: 'units along axis 2'}
 	wcs.add, { $
 		name: 'PC1_1', $
 		value: pc[0, 0], $
@@ -144,47 +144,47 @@ function metis_wcs, header, cal_pack, ref_detector = ref_detector
 	wcs.add, { $
 		name: 'CDELT1', $
 		value: cdelt[0], $
-		comment: '[arcsec] Pixel scale along axis 1'}
+		comment: '[arcsec] pixel scale along axis 1'}
 	wcs.add, { $
 		name: 'CDELT2', $
 		value: cdelt[1], $
-		comment: '[arcsec] Pixel scale along axis 2'}
+		comment: '[arcsec] pixel scale along axis 2'}
 	wcs.add, { $
 		name: 'CROTA', $
 		value: atan(pc[0, 1], pc[0, 0]) * !radeg, $
-		comment: '[deg] Rotation angle'}
+		comment: '[deg] rotation angle'}
 	wcs.add, { $
 		name: 'CRVAL1', $
 		value: crval[0], $
-		comment: '[arcsec] Value of reference pixel along axis 1'}
+		comment: '[arcsec] value of reference pixel along axis 1'}
 	wcs.add, { $
 		name: 'CRVAL2', $
 		value: crval[1], $
-		comment: '[arcsec] Value of reference pixel along axis 2'}
+		comment: '[arcsec] value of reference pixel along axis 2'}
 	wcs.add, { $
 		name: 'CRPIX1', $
 		value: crpix[0], $
-		comment: '[pixel] Reference pixel location along axis 1'}
+		comment: '[pixel] reference pixel location along axis 1'}
 	wcs.add, { $
 		name: 'CRPIX2', $
 		value: crpix[1], $
-		comment: '[pixel] Reference pixel location along axis 2'}
+		comment: '[pixel] reference pixel location along axis 2'}
 	wcs.add, { $
 		name: 'SUN_XCEN', $
 		value: sunpix[0], $
-		comment: '[pixel] Sun center location along axis 1'}
+		comment: '[pixel] sun center location along axis 1'}
 	wcs.add, { $
 		name: 'SUN_YCEN', $
 		value: sunpix[1], $
-		comment: '[pixel] Sun center location along axis 2'}
+		comment: '[pixel] sun center location along axis 2'}
 	wcs.add, { $
 		name: 'SUNPIX1', $
 		value: sunpix[0], $
-		comment: '[pixel] Sun center location along axis 1'}
+		comment: '[pixel] sun center location along axis 1'}
 	wcs.add, { $
 		name: 'SUNPIX2', $
 		value: sunpix[1], $
-		comment: '[pixel] Sun center location along axis 2'}
+		comment: '[pixel] sun center location along axis 2'}
 	wcs.add, { $
 		name: 'IO_XCEN', $
 		value: borpix[0], $
@@ -248,11 +248,11 @@ function metis_wcs, header, cal_pack, ref_detector = ref_detector
 	wcs.add, { $
 		name: 'INN_FOV', $
 		value: 1.6, $
-		comment: '[deg] Inner Metis FOV'}
+		comment: '[deg] inner Metis FOV'}
 	wcs.add, { $
 		name: 'OUT_FOV', $
 		value: 3.4, $
-		comment: '[deg] Outer Metis FOV'}
+		comment: '[deg] outer Metis FOV'}
 
 	return, wcs
 end
diff --git a/solo_get_ephemeris.pro b/solo_get_ephemeris.pro
index 061cce0f7976ba798909095b81eec476f4f05d77..7e5eac0472047a838d1e044a098990ca8314b232 100644
--- a/solo_get_ephemeris.pro
+++ b/solo_get_ephemeris.pro
@@ -16,7 +16,7 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'LONPOLE', $
 		value: 180., $
-		comment: '[deg] Native longitude of the celestial pole'}
+		comment: '[deg] native longitude of the celestial pole'}
 
 	; spherical coordinates of the S/C in the heeq (i.e., stonyhurst) frame
 
@@ -30,33 +30,33 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'RSUN_ARC', $
 		value: rsun_arc, $
-		comment: '[arcsec] Apparent photospheric solar radius'}
+		comment: '[arcsec] apparent photospheric solar radius'}
 	ephemerides.add, { $
 		name: 'RSUN_REF', $
 		value: rsun, $
-		comment: '[m] Assumed physical solar radius'}
+		comment: '[m] assumed physical solar radius'}
 
 	solar_angles = solo_get_solar_angles(utc)
 
 	ephemerides.add, { $
 		name: 'SOLAR_B0', $
 		value: solar_angles[0], $
-		comment: '[deg] S/C tilt of solar North pole'}
+		comment: '[deg] S/C tilt of solar north pole'}
 	ephemerides.add, { $
 		name: 'SOLAR_P0 ', $
 		value: solar_angles[1], $
-		comment: '[deg] S/C celestial North to solar North angle'}
+		comment: '[deg] S/C celestial north to solar north angle'}
 	ephemerides.add, { $
 		name: 'SOLAR_EP', $
 		value: solar_angles[2], $
-		comment: '[deg] S/C ecliptic North to solar North angle'}
+		comment: '[deg] S/C ecliptic north to solar north angle'}
 
 	carrot = solo_get_carringrot(utc)
 
 	ephemerides.add, { $
 		name: 'CAR_ROT', $
 		value: carrot, $
-		comment: 'Carrington rotation number'}
+		comment: 'carrington rotation number'}
 
 	ephemerides.add, { $
 		name: 'HGLT_OBS', $
@@ -74,24 +74,24 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'CRLT_OBS', $
 		value: coord[2], $
-		comment: '[deg] S/C Carrington latitude (B0 angle)'}
+		comment: '[deg] S/C carrington latitude (B0 angle)'}
 	ephemerides.add, { $
 		name: 'CRLN_OBS', $
 		value: coord[1], $
-		comment: '[deg] S/C Carrington longitude (L0 angle)'}
+		comment: '[deg] S/C carrington longitude (L0 angle)'}
 
 	ephemerides.add, { $
 		name: 'DSUN_OBS', $
 		value: solo_dist, $
-		comment: '[m] S/C distance from Sun'}
+		comment: '[m] S/C distance from sun'}
 	ephemerides.add, { $
 		name: 'DSUN_AU', $
 		value: solo_dist/au, $
-		comment: '[AU] S/C distance from Sun'}
+		comment: '[AU] S/C distance from sun'}
 	ephemerides.add, { $
 		name: 'AU_REF', $
 		value: au, $
-		comment: '[m] Assumed physical Astronomical Unit'}
+		comment: '[m] assumed physical astronomical unit'}
 
 	; coordinates of the S/C in the hee frame
 
@@ -101,15 +101,15 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'HEEX_OBS', $
 		value: coord[0], $
-		comment: '[m] S/C Heliocentric Earth Ecliptic X'}
+		comment: '[m] S/C heliocentric earth ecliptic x'}
 	ephemerides.add, { $
 		name: 'HEEY_OBS', $
 		value: coord[1], $
-		comment: '[m] S/C Heliocentric Earth Ecliptic Y'}
+		comment: '[m] S/C heliocentric earth ecliptic y'}
 	ephemerides.add, { $
 		name: 'HEEZ_OBS', $
 		value: coord[2], $
-		comment: '[m] S/C Heliocentric Earth Ecliptic Z'}
+		comment: '[m] S/C heliocentric earth ecliptic z'}
 
 	; coordinates of the S/C in the hci frame
 
@@ -120,28 +120,28 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'HCIX_OBS', $
 		value: coord[0], $
-		comment: '[m] S/C Heliocentric Inertial X'}
+		comment: '[m] S/C heliocentric inertial x'}
 	ephemerides.add, { $
 		name: 'HCIY_OBS', $
 		value: coord[1], $
-		comment: '[m] S/C Heliocentric Inertial Y'}
+		comment: '[m] S/C heliocentric inertial y'}
 	ephemerides.add, { $
 		name: 'HCIZ_OBS', $
 		value: coord[2], $
-		comment: '[m] S/C Heliocentric Inertial Z'}
+		comment: '[m] S/C heliocentric inertial z'}
 
 	ephemerides.add, { $
 		name: 'HCIX_VOB', $
 		value: vel[0], $
-		comment: '[m/s] S/C Heliocentric Inertial X velocity'}
+		comment: '[m/s] S/C heliocentric inertial x velocity'}
 	ephemerides.add, { $
 		name: 'HCIY_VOB', $
 		value: vel[1], $
-		comment: '[m/s] S/C Heliocentric Inertial Y velocity'}
+		comment: '[m/s] S/C heliocentric inertial y velocity'}
 	ephemerides.add, { $
 		name: 'HCIZ_VOB', $
 		value: vel[2], $
-		comment: '[m/s] S/C Heliocentric Inertial Z velocity'}
+		comment: '[m/s] S/C heliocentric inertial z velocity'}
 
 	; coordinates of the S/C in the hae frame
 
@@ -151,15 +151,15 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'HAEX_OBS', $
 		value: coord[0], $
-		comment: '[m] S/C Heliocentric Aries Ecliptic X'}
+		comment: '[m] S/C heliocentric aries ecliptic x'}
 	ephemerides.add, { $
 		name: 'HAEY_OBS', $
 		value: coord[1], $
-		comment: '[m] S/C Heliocentric Aries Ecliptic Y'}
+		comment: '[m] S/C heliocentric aries ecliptic y'}
 	ephemerides.add, { $
 		name: 'HAEZ_OBS', $
 		value: coord[2], $
-		comment: '[m] S/C Heliocentric Aries Ecliptic Z'}
+		comment: '[m] S/C heliocentric aries ecliptic z'}
 
 	; coordinates of the S/C in the heeq frame
 
@@ -169,15 +169,15 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'HEQX_OBS', $
 		value: coord[0], $
-		comment: '[m] S/C Heliocentric Earth Equatorial X'}
+		comment: '[m] S/C heliocentric earth equatorial x'}
 	ephemerides.add, { $
 		name: 'HEQY_OBS', $
 		value: coord[1], $
-		comment: '[m] S/C Heliocentric Earth Equatorial Y'}
+		comment: '[m] S/C heliocentric earth equatorial y'}
 	ephemerides.add, { $
 		name: 'HEQZ_OBS', $
 		value: coord[2], $
-		comment: '[m] S/C Heliocentric Earth Equatorial Z'}
+		comment: '[m] S/C heliocentric earth equatorial z'}
 
 	; coordinates of the S/C in the gse frame
 
@@ -187,15 +187,15 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'GSEX_OBS', $
 		value: coord[0], $
-		comment: '[m] S/C Geocentric Solar Ecliptic X'}
+		comment: '[m] S/C geocentric solar ecliptic x'}
 	ephemerides.add, { $
 		name: 'GSEY_OBS', $
 		value: coord[1], $
-		comment: '[m] S/C Geocentric Solar Ecliptic Y'}
+		comment: '[m] S/C geocentric solar ecliptic y'}
 	ephemerides.add, { $
 		name: 'GSEZ_OBS', $
 		value: coord[2], $
-		comment: '[m] S/C Geocentric Solar Ecliptic Z'}
+		comment: '[m] S/C geocentric solar ecliptic z'}
 
 	; light travel times and radial velocity of the S/C
 
@@ -206,15 +206,15 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'OBS_VR', $
 		value: rad_vel, $
-		comment: '[m/s] Radial velocity of S/C relative to Sun'}
+		comment: '[m/s] radial velocity of S/C relative to sun'}
 	ephemerides.add, { $
 		name: 'EAR_TDEL', $
 		value: t_del, $
-		comment: '[s] Time(Sun to Earth) - Time(Sun to S/C)'}
+		comment: '[s] time(sun to earth) - time(sun to S/C)'}
 	ephemerides.add, { $
 		name: 'SUN_TIME', $
 		value: sun_time, $
-		comment: '[s] Time(Sun to S/C)'}
+		comment: '[s] time(sun to S/C)'}
 
 	; corrections of the acquisition date
 
@@ -227,11 +227,11 @@ function solo_get_ephemeris, header, cal_pack
 	ephemerides.add, { $
 		name: 'DATE_EAR', $
 		value: date_ear, $
-		comment: '[UTC] Obs. start time corrected to Earth'}
+		comment: '[UTC] obs. start time corrected to earth'}
 	ephemerides.add, { $
 		name: 'DATE_SUN', $
 		value: date_sun, $
-		comment: '[UTC] Obs. start time corrected to Sun'}
+		comment: '[UTC] obs. start time corrected to sun'}
 
 	return, ephemerides
 end