[STATSGRASS] plot of mean slope x elevation

[Carlos "Guâno" Grohmann]

Does anyone know how to make a plot of mean slope x elevation like
figures 8 and 9 of:
Guth, P. L. , 2006. Geomorphometry from SRTM: Comparison to NED
Photogrammetric Engineering and Remote Sensing, , 72, 269-278

see figure attached

thanks
Carlos

-- 
+-----------------------------------------------------------+
              Carlos Henrique Grohmann - Guano
  Visiting Researcher at Kingston University London - UK
  Geologist M.Sc  - Doctorate Student at IGc-USP - Brazil
Linux User #89721  - carlos dot grohmann at gmail dot com
+-----------------------------------------------------------+
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