hi ed: >What version of MITgcm are you using? excerpted from the state.*.nc file: // global attributes: :MITgcm_version = "checkpoint57e_post" ; :MITgcm_tag_id = "1.464 2005/03/03" ; :MITgcm_mnc_ver = 0.9 ; i did think about updating and will do that as my next step and rerun my examples. thanx. michael