Oblique annotations in GMT6's colorbar

Since this week, the Generic mapping tools (GMT) have an option to plot colorscale annotations at an angle. After describing my quest to produce annotated geological time scale stages GMT forum post, Paul swiftly implemented the ''-S+a'' option in ''gmt colorbar''. This greatly helps with non-numeric colorscales such as the geological time scale.

 Testing the new ''gmt colorbar -S+a'' option


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