SECTION./FIT
COMPUTE/FIT image[,error]   [= function[(refima)]]
	compute fitted image values
COMPUTE/FIT table y[,error] [= function[(ind)]]
	compute fitted table values
SECTION./FUNC
COMPUTE/FUNCTION image    = function[(refima)]
	compute function values, result as image
COMPUTE/FUNCTION table y  = function[(ind)]
	compute function values, result in table column
