I used the following files.  Note two of the sources are listed as cal_g34.4.
I don't know if this is true, or just a typo and they should be cal_g34.3.

sharc2-052722.fits   cal_crl2688
sharc2-052723.fits   cal_g34.3
sharc2-052724.fits   cal_g34.3
sharc2-052725.fits   cal_g34.3
sharc2-052726.fits   cal_g34.3
sharc2-052738.fits   cal_g34.3
sharc2-052750.fits   cal_g34.3
sharc2-052751.fits   cal_g34.3
sharc2-052752.fits   cal_g34.3
sharc2-052753.fits   cal_g34.3
sharc2-052785.fits   cal_crl2155
sharc2-052787.fits   cal_crl2688
sharc2-052788.fits   cal_crl2688
sharc2-052793.fits   cal_g34.3
sharc2-052794.fits   cal_g34.4
sharc2-052817.fits   cal_g34.3
sharc2-052818.fits   cal_g34.3
sharc2-052819.fits   cal_g34.4

I also chose rgm_strict.dat as the best rgm since there is a lot of 
electronic noise.