init rings
Merge branch 'newzpr' into rings
Merge branch 'master' into rings
ring test
before della
rings
Merge branch 'master' into rings
Merge branch 'master' into rings
output
Merge branch 'master' into rings
nicer
ring ok
size as paramter
minor
Merge branch 'master' into rings
Merge branch 'master' into rings
center of momentum
not sure how to do pr drag correctly
not time symmetric
Merge branch 'master' into rings