The COS-B effective area matrix file is in the standard effective area matrix FITS format for X-ray astronomy (see the document CAL/GEN/92-019). The effective area is given for 7 energy channels and out to an zenith angle of 30 degrees in 0.5 degree increments.
No dependence on pair angle is made
Brenden Perry (HEASARC)
(see CAL/GEN/92-019, available on-line as postscript and html versions).
No information supplied to the CALDB other than that above.