It contains a group of shells for plotting figures in paper " Calibration of an Airborne Interferometric Radar Altimeter over the Qingdao Coast Sea, China" of Remote Sensing. First, you need GMT to plot these figures.
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Yang, L.; Xu, Y.; Zhou, X.; Zhu, L.; Jiang, Q.; Sun, H.; Chen, G.; Wang, P.; Mertikas, S.P.; Fu, Y.; et al. Calibration of an Airborne Interferometric Radar Altimeter over the Qingdao Coast Sea, China. Remote Sensing 2020, 12, 1651, doi:10.3390/rs12101651.