Scaleable Differences Palette (with one grey interval above and below zero) Schema: Differences are color-coded from negative (in red or Hell) to positive (in blue or Heaven). Differences close to zero are shown in grey. This palette is usefull for the following purposes: a) color coding of differences in multiples of expected standard deviation STD; Differences between ± 1*STD appear in grey. Differences from +1*STD to +2*STD appear in light green and differences from -1*STD to -2*STD appear in light yellow, etc. The darkness of the color grows with the factor of STD. b) marking of differences fullfilling a tolerance TOL; Differences between ± TOL (and thus fullfilling TOL) appear in grey. Differences exceeding ± TOL appear in color. Use either STD or TOL as scalar factor for -scalePal in opalsZcolor. Hint on rows in palette definition: all values within [this_val, next_larger_val) get this_color