# Component/ parameter constraint Comment # operation (see below) range 3_2_1_9 x offset # Hard constraint: Constrains the # x parameter for components 3, 2, # 1, and 9 to have RELATIVE positions # defined by the initial parameter file. 1_5_3_2 re ratio # Hard constraint: similar to above # except constrain the Re parameters # by their ratio, as defined by the # initial parameter file. 3 n 0.7 to 5 # Soft constraint: Constrains the # sersic index n to within values # from 0.7 to 5. 2 x -1 0.5 # Soft constraint: Constrains # x-position of component # 2 to within +0.5 and -1 of the # >>INPUT<< value. 3-7 mag -0.5 3 # Soft constraint: The magnitude # of component 7 is constrained to # be WITHIN a range -0.5 mag brighter # than component 3, 3 magnitudes # fainter. 3/5 re 1 3 # Soft constraint: Couples components # 3 and 5 Re or Rs ratio to be greater # than 1, but less than 3. # Note on parameter column: # The parameter name options are x, y, mag, re (or rs -- it doesn't matter), # n, alpha, beta, gamma, pa, q, c, f1a (Fourier amplitude), f1p (Fourier # phase angle), f2a, f2p, r5 (coordinate rotation), etc., . Or # alternatively, one can specify the parameter number instead (for the # classical parameters only) corresponding to the same numbers in the # galfit input file.