/home/runner/work/splot/splot/splot/_viz_giddy_mpl.py:276: UserWarning: No data for colormapping provided via 'c'. Parameters 'cmap' will be ignored c = ax.scatter ...
Using prepare_nodeseries, HydPy tries to perpare every node, also the nodes without external obs data. This leads to the fact that HydPy throws a UserWarning for every node with missing obs series.