Grid lines at <1 second intervals when using -JXt (absolute time)

Q&A
1

Hi,

I was just wondering if there is a way to get -B gridline intervals at less than 1 s spacing when using absolute times. I tried using g0.2 to get gridlines every 0.2 seconds, but

gmt basemap -JX20ct/10c -R0/30/-15/1 -BlSrn -Bxa5Sf1g0.2+a60+l"time (s)" -Byg1 -pdf temp

gives the error message

basemap [ERROR]: Time step interval (0.2) must be an integer

Is there any way around this?

Thanks
Tom

EDIT: Of course, I’ve just realised that I can plot a basemap underneath with -JX rather than -JXt using the same -R, and plot 0.2-interval gridlines with no annotations, and then plot my absolute-time basemap directly on top, with annotations but no gridlines. However I guess it would be nice to do this in one line rather than two.