Spent a while today working on these plots after rejecting every obvious bad point: /scratch/adam_work/plots/sourcecompare_0_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_10_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_1_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_2_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_3_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_4_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_5_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_6_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_7_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_8_rawcsoptg_0707.ps /scratch/adam_work/plots/sourcecompare_9_rawcsoptg_0707.ps /scratch/adam_work/plots/models_rawcsoptg_0707.ps The net result is, I still don't have a nice small RMS offset Update 8/12/08: using RA/DEC mapping doesn't help.