functions only exported to be used internally by stars
.get_layout(bb, n, total_size, key.pos, key.length).degAxis(side, at, labels, ..., lon, lat, ndiscr, reset)
.image_scale(z, col, breaks = NULL, key.pos, add.axis = TRUE, at = NULL,
..., axes = FALSE, key.length)
.image_scale_factor(z, col, breaks = NULL, key.pos, add.axis = TRUE, ...,
axes = FALSE, key.width, key.length)
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