Problem in generating the hippocampal volume source space

Hello,
I used the program given in the link,
https://martinos.org/mne/stable/auto_examples/forward/plot_left_cerebellum_volume_source.html
.
Instead of Cerebellum i tried to generate the hippocampus volume source
space. The final output gives the inappropriate structure of hippocampus. I
mean that the hippocampal surface is downsampled to higher extent. I wanted
to know how can i control the downsampling rate in the code given in the
link above. Which parameters are to be altered?

The program also setup the sources within and on the hippocampal surface.
Is there any way that i can get the sources only on the surface of
hippocampus?
Thank You

hi Pooja,

you should reduce the value of the pos parameter
in setup_volume_source_space
(eg make it 2) to position more densely sources.

HTH
Alex