How to change the frame like this

[Phd.Yin]

Hello. My code is like this:

and plot is

I want to remove the rail frame，and plot the frame like this:

I have tried a lot,please give some advices.Thanks.

[mgrund]

This can be done via pygmt.config():

import pygmt
fig = pygmt.Figure()
pygmt.config(MAP_FRAME_TYPE = 'plain')
...

The default frame type is fancy.

[Phd.Yin]

Thanks, it worked.