3. Input data file

The data file that contains the IDs identifying each star, the star’s coordinates and their full photometric data must follow certain rules.

1. Data must be arranged into columns using points as decimal separators.
2. All lines which are not part of the data columns must be commented out using a # symbol at the beginning.
3. ID strings must be unique, ie: no two stars should have the same ID.
4. All photometric values (either magnitudes or colors) outside the range [-50., 50.] will be considered as bad photometry and any star showing such a value for any of its magnitudes/colors will be discarded.
5. All photometric columns must have an associated error column.
6. At least one magnitude column must be defined.