jLab: a data analysis package for Matlab. A data analysis package for Matlab, with ∼300 routines for big data analysis, signal processing, mapping, and oceanographic applications. Version 1.6.5 introduces the jMatern module for parametric spectral analysis and modeling using the Matérn process, including maternfit for parameter fitting using the de-biased Whittle likelihood method, together with as some small improvements. See the changelog for details.