data_vars ["sigma4"]

sigma4

cmap	'cmo.dense'
name	None
alt_names
squeeze	None
search_order	'sn'
loc	None
add_loc	False
exclude	False

["attrs"]

long_name	'Sea water potential density with ref at 4000 dbar'
units	'kg m-3'
standard_name

["add_coords_loc"]

Empty dictionary

["select"]

Empty dictionary