"Color terms of DECam vs SDSS Stripe-82 photometry for stars with g-r<0.8 are within 0.01 (??? TBC) of values predicted from synthetic photometry using DECal data and atmospheric models."
This is primarily a test of how well we understand our filter passband system response curves.
This test is the same as Cal-R2, but with tighter tolerances.
See Prerequisites for Cal-R2.
See Procedure for Cal-R2.
The values of the fitted color ("b") terms must be within 0.01 mag/mag of the synthetic values.
If the measured (fitted) values color terms are out of tolerance with their synthetic values, we will need
to identify the source of error. This will likely require involvement by the DECal team. Since this is an enhanced goal (compared with the requirements for test Cal-R2, failing this test would not prevent moving forward with DES operations.
See Other Notes for Cal-R2.