SECTION./BACKGROUND FIT/BACKGROUND outframe = inframe(s) [deg,it] [clp1,clpn] [skew] [outbck] FIT/BACKGROUND outframe = inframe(s) [coef] [outbck] FIT/BACKGROUND inframe(s) [deg,it] [clp1,clpn] [skew] [outbck] FIT/BACKGROUND inframe(s) [coef] [outbck] compute 2-dim. polynomial fit of the background SECTION./ELL1 FIT/ELL1 inframe outframe l_iso,h_iso x_cen,y_cen max_rad fit an ellips with respect to predefined center SECTION./ELL2 FIT/ELL2 inframe pol_opt iso_tol iso_levels [center[ [radius] [sky_level] fit an ellips with respect to predefined center SECTION./ELL3 FIT/ELL3 inframe outframe [step] [x,y] [low,high] [min,max] [opt] fit ellipses to the isophotes of an object in a 2-dim. frame SECTION./POSI FIT/POSINC infram orient rin,rout,rstep region fit the position angle and inclination to 2nd and 4th harmonic