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say "NOISE [Xmin] [Xmax] [RMS] will compute and plot the noise distribution"
say "on each selected plane. Arguments to the procedure are:"
say "  Xmin: lower X range on plot (default -2.5*RMS),"
say "  Xmax: upper X range on plot (default +2.5*RMS),"
say "  RMS: rough estimate of the noise (default guessed with COMPUTE RMS)"
say " "
say "* For each plane, the data is binned in an histogram in the range Xmin"
say "* to Xmax. The standard deviation of the noise distribution of this"
say "* plane is estimated by fitting a gaussian model on the histogram."
say " "
say "* In return, the median of the standard deviation of all the planes is"
say "* saved in the variable NOISE"
say " "
say "* Channels are controlled by variables FIRST and LAST"
say "* Current input values:"
say " "
say "  FIRST [" 'bold''first''norm' "]         LAST [" 'bold''last''norm' "]"
say " "
say "  Map name is" 'bold''name'.'type''norm'
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