is a 2 color fill effect of the columns.

With the graph displayed, if you click on any column then right click and select ''Format Data Series'', then under the ''Fill Effects'' button, you can choose a two color option and select ''Horizontal'' as the shading style. In the variants, select the top left hand box to limit the transition to one color.

I don't know any other way to give columns multiple colors, sorry.

Mark