Modifications to xs to apply it to MicroHH and Tropomi. Changes for wind.py to make it compatible with backwards integrated wind. Changes to vis.py to plot TROPOMI mass balance.

Unmix plumes

Rewrite cross-sectional flux method (and add support for reading TROPOMI data)

Fix coco2 dims and other bugs

Fix bugs with using along dimensions in CoCO2 dataset and another bug with nans uncertainties of fluxes for noise-free data.