Plot gapped axis in gmt


I am trying to keep gap in between y-axis at 9.5 to 11.5 to show my extended part of the y-axis in my line plot. I am trying following but it is not working.

gmt psbasemap -JX3i/3i -R1979/2018/5/18 -F+c9.5/11.5 -BX1f1 -By2f1 -BWSne -P -K >

This gives me an error that -F is only allowed with -L and -T. As I know -T is for the rose plot which I can not use in the simple line plot. How can I use gapped axis with simple -B option in line plot?

Help me to resolve this.
Thank you