cformat switch:  b

Allows you to apply custom background colors to individual rows. Same concept as the column type c (below) except that it only uses colors defined by RGBfg or RGBbg clauses (either on the pseudo column or on any other column). The column must contain a single alphabetic character (A-Z) matching an RGB color index, or, if you prefer numbers, you can use a single digit 0-9 (which is treated as equivalent to A-J).