tbin

 TBIN N1 N2 N3 NT1 NT2 METHOD [FRAC] -- Rebins to wavelength scale of
                                        template spectra.

 Spectra will be rebinned onto the wavelength scale of another set of 
 spectra or a single spectrum.

 Parameters: 
     
  N1    -- Slot number of first spectrum to rebin
  N2    -- Slot number of last spectrum to rebin
  N3    -- Slot in which to start results
  NT1   -- First and last template spectra. Same to
  NT2   -- get just one.
  METHOD - Interpolation method. Choices:
           L(inear), Q(uadratic), S(inc)

           Quadratic rebinning is recommended for most purposes. Linear
           rebinning is only in case speed is of the essence. Both linear
           and quadratic rebinning cause significant smoothing of the data
           (especially linear). In an effort to reduce this rebinning using
           a (Sin X)/X = "Sinc" has been implemented. This is much slower, but 
           may be necessary if you are interested in measuring broadening at 
           a level near your spectral resolution for example. The sinc
           function is tapered by a window function to reduce overshoot in
           frequency space. If you do use sinc rebinning, it would be well to
           get rid of cosmic rays and other bad pixels first since their
           effects can spread. A check is made to see if the rebinning 
           requested is really just a shift in which case a fast version
           of sinc interpolation is used.

  FRAC --  (Not prompted for) Minimum fraction of output pixel covered
           by input pixel for it to be masked.

This command belongs to the class: manipulation