To set the attributes for the chart frame, the half-moon of Dial charts and the boxes around notes:

chSet 'Box' 'Green,10%,2'
chSet 'Box' 3 2 1.5

You can use numbers strictly in the sequence shown above (Colour, Pattern, Weight). The patterns number from 1–39 and you can give an exact line weight in points for the edge. The default is solid white with a 1.5-point edge. The edge is always black. The Mobiles example shows a typical use of a lightly shaded chart box, with the key in a white knock-out within it.

The last 4 radial gradients (35-39) are designed to make effective backdrops when used with a fairly dark base colour.

See also ...
Colour Cycle
Gutter – chart gutter
KeyAttributes – key box attributes
Nib Weights
Shading Patterns