Horizontal Mean & Diff/RMS compared to obs
TEMP diff:   Global  Arctic  Atlantic  Gin  Hudson  Indian  Labrador  Pacific  Southern
TEMP rms:   Global  Arctic  Atlantic  Gin  Hudson  Indian  Labrador  Pacific  Southern
SALT diff:   Global  Arctic  Atlantic  Gin  Hudson  Indian  Labrador  Pacific  Southern
SALT rms:   Global  Arctic  Atlantic  Gin  Hudson  Indian  Labrador  Pacific  Southern