Fig. 3
Synthetic color transformation between the center and the corner of the filters (17 cm from the center) in each band. Dots are synthetic magnitudes computed for stellar spectra from the Gunn & Stryker (1983) spectral library. Linear color transformation (solid line) are adjusted in the range delimited by vertical dashed lines. The color index is a Vega MegaCam color. The red square figures the synthesized transformation of the spectrophotometric standard star BD +17 4708 computed from its STIS spectrum available from the CALSPEC database.
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