If you think it is appropriate, you may consider paying us back by including our latest article in the reference list of your future publications that will benefit from the availability of GMT:
Wessel, P., Luis, J. F., Uieda, L., Scharroo, R., Wobbe, F., Smith, W. H. F., & Tian, D. (2019). The Generic Mapping Tools version 6. Geochemistry, Geophysics, Geosystems, 20, 5556–5564. https://doi.org/10.1029/2019GC008515
Here is a BibTeX entry for LaTeX users:
@article{doi:10.1029/2019GC008515,
title = {The {Generic Mapping Tools} Version 6},
author = {Wessel, P. and Luis, J. F. and Uieda, L. and Scharroo, R. and Wobbe, F. and Smith, W. H. F. and Tian, D.},
journal = {Geochemistry, Geophysics, Geosystems},
year = {2019},
volume = {20},
number = {11},
pages = {5556-5564},
doi = {10.1029/2019GC008515}
}