From [gallery/subplots_axes_and_figures/align_labels_demo.cpp](https://github.com/soblin/matplotlibcpp17/blob/master/gallery/subplots_axes_and_figures/align_labels_demo.cpp).
From [gallery/subplots_axes_and_figures/align_labels_demo.cpp](https://github.com/soblin/matplotlibcpp17/blob/master/gallery/subplots_axes_and_figures/align_labels_demo.cpp).