coords ["sig"]

sig

name	None
alt_names	's_level' 'sigma' 's' 'sigma_level'
search_order	'ns'
add_loc	True

["attrs"]

axis	'Z'
long_name	'Sigma level'
standard_name	'ocean_sigma_coordinate' 'ocean_s_coordinate' 'atmosphere_sigma_coordinate' 'atmosphere_s_coordinate' 'ocean_s_coordinate_g1' 'ocean_s_coordinate_g2'
units