These are the different types of models that psphot takes:

(these are located in psModules/src/objects/models)

|| psphot name || filename || function || comment ||
|| PS_MODEL_GAUSS || pmModel_GAUSS.c || exp(-z)  || Pure gaussian ||
||PS_MODEL_PGAUSS || pmModel_PGAUSS.c || 1 / (1 + z + z^2^/2 + z^3^/6)  || Gaussian taylor expansion ||
||PS_MODEL_PS1_V1 || pmModel_PS1_V1.c ||  1 / (1 + kz + z^(3.33/2)^)  (z = r^2^, so r^3.33^) || power-law with fitted linear term ||
||PS_MODEL_QGAUSS || pmModel_QGAUSS.c ||  1 / (1 + kz + z^2.25^) || power-law with fitted linear term ||
||PS_MODEL_RGAUSS || pmModel_RGAUSS.c || 1 / (1 + z + z^alpha^) || power-law with fitted slope ||
||PS_MODEL_SERSIC || pmModel_SERSIC.c ||  f = exp(-z^n^) || ||