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# CHANGELOG
All changes to the Metis L1 pipeline are documented in this file.
## 2.3.1 - 2021-04-19
- Fixed a bug that caused an incorrect FITS file format: images with unsigned or long integer data type were saved as signed integers with the wrong BSCALE and BZERO scale keywords.
## 2.3 - 2021-03-10
- Fix a bug that caused incorrect pixel counts in re-binned images. Pixel counts are now correctly multiplied by the square of the binning factor after re-binning.
- Introduce the correction for the total effective exposure time: pixel counts are now multiplied by the number of frames that were averaged during the acquisition, so as not to change the real signal-to-noise statistics in each pixel, related to counts integrated over the total effective exposure time. The XPOSURE and NSUMEXP keywords of the FITS, which are affected, are properly updated using parameters DIT, NDIT, NDIT1, and NDIT2.
- Add the HV_TEMP keyword in the FITS header of UV images.
- Fix a bug that caused some keywords in the FITS header of light curves to be incorrectly ordered.
## 2.2 – 2020-11-25
- Change the way how the house-keeping parameters are saved into the FITS binary table, in order to prevent very long computation times when the house-keeping parameter table is large in data volume.
- Modify the decode_obt.pro routine to fix a bug that caused the OBT_BEG and OBT_END keyword values to be converted from double to long.
- Optimise some keyword description texts in the FITS header.
- Add the make_bin_table.pro routine.
- Remove the strreplace.pro routine.
## 2.1 – 2020-11-13
- Fix a bug that triggered the re-binning of VL images even when not necessary.
- Fix a bug that caused an error in writing the log file for data products that are not images (e.g., light curves).
## 2.0 – 2020-10-06
- Include the re-binning of images that had been acquired with binning enabled, so that the size of the data in the FITS is consistent with the commanded binning.
- Modify the interpolation method of house-keeping parameters to manage cases in which interpolation fails, avoiding output values such as “NaN” or “Inf”.
- Add conversion to string for all the keywords of the scientific header that are boolean type.
- Include the generation of a log file with information on the processing and errors, useful for debugging.
## 1.1 – 2020-04-21
- Modify the interpolation method of house-keeping parameters to take into account:
- the possible lack of a parameter;
- the possible presence of an uncalibrated parameter (whose engineering value is flagged with “N/A”);
- the fact that the GEN_TIME keyword is provided in UTC rather than OBT.
- Fix a bug that prevented the correct update of some keywords of the FITS header, in particular those related to sensor temperatures, whose values are interpolated using the input house-keeping parameter table.
- Add correct computation of the TELAPSE and XPOSURE keywords.
- Include the EMPTY_PARAMS keyword in the output auxiliary JSON file, containing the list of house-keeping parameters in the input table that are not calibrated but which have been interpolated to correct the value of some of the FITS header keywords.
- Revise the structure of the binary table containing the house-keeping parameters to make it more user-friendly.
## 1.0 – 2020-03-06
- Add several optimisations to the code.
- Add the decode_obt.pro routine.
## 0.0 – 2020-01-16