Usage: WlzHistogramSmooth [-h] [-a] [-o< out file >] [-s#] [< in object >]
      Options:
      -a Output the histogram as ascii data not a Woolz histogram object.
      -o Output object/data file name.
      -s Smoothing factor (bins for gaussian half height full width).
      -h Help, prints this usage message.
      Smooths a Woolz histogram object.
      Objects/data are read from stdin and written to stdout unless the
      filenames are given.
      Example: WlzHistogramSmooth -s3 -a myhist.wlz | xgraph
      The input Woolz histogram object is read from myhist.wlz, smoothed
      by convolving the histogram bins with a gaussian which has a half