The current conversion of ngmix profile to a GSObject has a subtle bug - the shape parameters are used to shear the circular object after profile creation (like a GSObject normally would) instead of being used in the initial creation of a GMixCM object (whose shape parameter cm_T is not circular!). We simply need to pass (g1,g2) to cm_params in the creation of a BalGMixCM object to fix this.
This resolves ~90% of the image residual discrepancy that Katie has seen in her tests.
The current conversion of
ngmixprofile to aGSObjecthas a subtle bug - the shape parameters are used to shear the circular object after profile creation (like aGSObjectnormally would) instead of being used in the initial creation of aGMixCMobject (whose shape parametercm_Tis not circular!). We simply need to pass(g1,g2)tocm_paramsin the creation of aBalGMixCMobject to fix this.This resolves ~90% of the image residual discrepancy that Katie has seen in her tests.