Added a shift to the redshift according to issue https://github.com/desihub/desisim/issues/442  I thought this was done, but it seems I lost the changes just before merging to master. Here it goes again.
Added a shift to the redshift according to issue https://github.com/desihub/desisim/issues/442  I thought this was done, but it seems I lost the changes just before merging to master. Here it goes again.

desihub/desisim,desihub/desisim