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Don’t use boxtype FL_NO_BOX for a chart object if it changes
value.
Normally, for bar and line chart a baseline is drawn at 0. This can be switched on and off by the function
void fl_set_chart_baseline(FL_OBJECT *ob, int yes_no);
The first color argument (col1) to
fl_set_object_color() controls the (background) color of
the box, the second (col2) the color of the baseline.