slightly better treatment of pixel shapes.  Cache it again, since there is some actual computation done (though very little)
slightly better treatment of pixel shapes.  Cache it again, since there
is some actual computation done (though very little)

e-koch/spectral-cube,low-sky/spectral-cube,jzuhone/spectral-cube,keflavich/spectral-cube,radio-astro-tools/spectral-cube