Data manipulation

ADJOIN -- Append two spectra (strictly a merge by wavelength value)
BCLEAN -- Automatic removal of bad lines & cosmic rays from CCD data
CFIT -- Generate a spectrum using the cursor
CLEAN -- Interactive patching of bad lines, bad pixels in an image
COADD -- Form the spectrum which is the mean of the rows in an image
COMBINE -- Combine two spectra, adding with weights according to errors
COSREJ -- Reject cosmic rays from a set of supposedly identical spectra
CREOBJ -- Create a data object or file
FSCRUNCH -- Rebin data with a disjoint wavelength coverage to a linear one
HCROSS -- Cross-correlate two spectra amp get redshift and error
HIST -- Produce histogram of data value distribution in an image
HOPT -- Histogram optimisation of an image
ICONV3 -- Convolve an image with a 3x3 convolution kernel
ICOR16 -- Corrects 16 bit data from signed to unsigned range
IDIFF -- Takes the 'differential' of an image
IGCONV -- Convolve an image with a specified filter
IREVX -- Reverse an image (or spectrum) in the X-direction
IREVY -- Reverse an image in the Y-direction
IROT90 -- Rotates an image through 90 degrees
MEDFILT -- Applies a square median filter to an image
MEDFILTR -- Applies a rectangular median filter to an image
MEDSKY -- Take the median of a number of images
POLYSKY -- Fits and subtracts sky from a long slit spectrum
SCLEAN -- Interactive patching of images, especially SCUBA data
SCNSKY -- Calculates a sky spectrum for a scanned CCD image
SCROSS -- Cross-correlate two spectra & get relative shift
SCRUNCH -- Rebin a spectrum to a linear wavelength range
SFIT -- Fit a polynomial to a spectrum