- replace one ()**.5 with SQRT ; use temp var "cdu = tau/Du"; both affect machine truncation (but exp cheapAML_box still pass with 13 digits)
- replace one ()**.5 with SQRT ; use temp var "cdu = tau/Du";
both affect machine truncation (but exp cheapAML_box still pass with 13 digits)

altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h,altMITgcm/MITgcm66h