Version 1.3a1 ============= Earlier versions of pywcs had two versions of every conversion method: X(...) -- treats the origin of pixel coordinates at (0, 0) X_fits(...) -- treats the origin of pixel coordinates at (1, 1) From version 1.3 onwards, there is only one method for each conversion, with an 'origin' argument: - 0: places the origin at (0, 0), which is the C/Numpy convention. - 1: places the origin at (1, 1), which is the Fortran/FITS convention.