sippi_colormap Default colormap for sippi
 
  Call :
    sippi_colormap; % the same as sippi_colormap(3);
 
  or :
    sippi_colormap(1) - Red Green Black
    sippi_colormap(2) - Red Green Blue Black
    sippi_colormap(3) - Jet
    sippi_colormap(4) - Parula
    sippi_colormap(5) - Geosoft