Number of color levels returned by the function. A calling graphic function with argument nlevels will typically take the first (i.e., bluest) nlevels color levels. If n<nlevels, the color levels are recycled

The higher it is, the more the palette blushes....

Either NULL or a list of arguments for adjustcolor, in which case adjustcolor is called to modify spaMM.colors's default vector of colors. See the documentation of the latter function for further information. All arguments except col are possible.