I'm plotting disk partitioning and available space.

I have a pie chart showing the partitioning: e.g. 30% `/`

, 70% `/home`

.

In the second ring I want to show that 90% `/`

is full, 10% of `/`

is empty. 10% `/home`

is full, 90% `/home`

is empty.

How can I generate the 'second' series of the wedges?

Please give example in LibreOffice, gnuplot, matplotlib, etc.

Something like this: