Fix typo in data file lines explanation

test_data/cluster/README.md

@@ -34,7 +34,7 @@ This directory contains test data for models made up by more than one sphere.
 	  v
    EOF_CODE
 ```
-were the different lines have the following roles:
+where the different lines have the following roles:
 1. declare the number of spheres and whether to add an external layer
 2. define the external dielectric constant and the scaling configuration
 3. define the vector of scales (either explicitly, with one element per row, or in steps, with only first element and step declared)
@@ -55,7 +55,7 @@ were the different lines have the following roles:
   OUTPUT_T-MATRIX_SCALE_NUMBER
 EOF_CODE
 ```
-were the different lines have the following roles:
+where the different lines have the following roles:
 1. general configuration of the scattering problem, with some specification of the transition between materials
 2. The vectors of spherical component Cartesian coordinates `xyz`
 3. definition of the elevation angle arrays for the incident and scattered radiation fields

test_data/sphere/README.md

@@ -23,7 +23,7 @@ This directory contains test data for the single sphere case.
 	  v
    EOF_CODE
 ```
-were the different lines have the following roles:
+where the different lines have the following roles:
 1. declare the number of spheres and whether to add an external layer
 2. define the external dielectric constant and the scaling configuration
 3. define the vector of scales (either explicitly, with one element per row, or in steps, with only first element and step declared)
@@ -41,7 +41,7 @@ were the different lines have the following roles:
   OUTPUT_T-MATRIX_SCALE_NUMBER
 EOF_CODE
 ```
-were the different lines have the following roles:
+where the different lines have the following roles:
 1. general configuration of the scattering problem, with some specification of the transition between materials
 2. definition of the elevation angle arrays for the incident and scattered radiation fields
 3. definition of the azimuth angle arrays for the incident and scattered radiation fields