ma_test modified for debug
fix metric tensor interpolation: R was not unitary
Revert "measure quality in real space until better fix"

This reverts commit 031ecec310e1a32c66d8ec01516ff5bea8526c91.
Revert "ma_test modified for debug"

This reverts commit 783d7134e6ffbab035aef518927b08802596b06c.