images,f,a,,,,List of input images
imasks,f,h,"",,,List of input image masks
omasks,f,h,"",,,List of output image masks
fields,s,h,"image,npix,mean,stddev,min,max",,,Fields to be printed
lower,r,h,INDEF,,,Lower limit for pixel values
upper,r,h,INDEF,,,Upper limit for pixel values
nclip,i,h,0,0,,Number of clipping iterations
lsigma,r,h,3.0,0,,Lower side clipping factor in sigma
usigma,r,h,3.0,0,,Upper side clipping factor in sigma
binwidth,r,h,0.1,,,Bin width of image histogram in sigma
format,b,h,yes,,,Format output and print column labels ?
cache,b,h,no,,,Cache the image in memory ?