SECTION./FCOE
COMPUTE/FCOEFF infram orient rin,rout,rstep outtab
	compute fourier coefficients of azimuthal profiles in spiral galaxies
SECTION./GRID
COMPUTE/GRID angle
	create image and table with distorted rect. and evenly spaced grid
SECTION./COMP
COMPUTE/SKY infram1 infram2 caltab method sky_factor
	compute the sky background and restitute the frame
