20.20 UV_PREVIEW

[ADVANCED\]UV_PREVIEW [TAPER Ntaper] [CLIP Threshold] [HISTO Nhisto] [SMOOTH Nsmooth] [/BROWSE [Ataper]] [/FILE UvData.uvt [Drop]]

A fast previewer to figure out if there is signal and what is its spectral shape. The command attempts to find out the line free regions and to estimate a continuum region.

The output of UV_PREVIEW can be used for further processing commands (UV_BASELINE and UV_FILTER, UV_SPLIT, SPECIFY, etc...)

If a catalog is defined (see HELP CATALOG), it will also display line identification (red for detected ones, blue for the others).

The behaviour is controlled by 4 parameters than can be set through the "KEY Value" optional argument pairs. These are

   TAPER   Ntaper    : number of scale sizes  (default 4)
   CLIP    Threshold : Clipping level in Sigma (default 3.5)
   SMOOTH  Nsmooth   : Number of spectral smoothing (default 3)
   HISTO   Nhisto    : Size of histogram

These values are "sticky": they remain valid until further change, and they can be listed by UV_PREVIEW ?