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@@ -74,7 +74,7 @@ The NASA/DLR GRACE and NASA/GFZ GRACE-FO twin satellite missions measure changes
Several researchers in Geosciences use level three GRACE data, which is obtained from `L2` Spherical harmonic coefficients, except JPL MASCONS which are derived from Level-1B satellite ranges. The procedure to convert `L2` to `L3` is called spherical harmonic synthesis. However, there are several pre-processing steps; such as anomaly calculation, replacing poor quality low degree coefficients, filtering, and correcting for signal damage due to filtering.
A few GRACE data processing tools are available based on the python programming language. These include [`gravity-toolkit`](https://gravity-toolkit.readthedocs.io/en/latest/)[@gravity-toolkit], [`ggtools`](https://pypi.org/project/ggtools/1.1.0/)[@ggtools] and [`frommle2`](https://github.com/strawpants/frommle2)[@frommle2]. General tools for spheric harmonic analysis are also available, such as [`SHTools`](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GC007529)[@wieczorek2018shtools]. [`SHbundle`](https://www.gis.uni-stuttgart.de/en/research/downloads/shbundle) provide MATLAB scripts for Spheric Harmonic Synthesis and Spherical Harmonic Analysis. The first version of the code was developed in 1994 while the latest version was released in 2021.
A few GRACE data processing tools are available based on the python programming language. These include [`gravity-toolkit`](https://gravity-toolkit.readthedocs.io/en/latest/)[@gravity-toolkit], [`ggtools`](https://pypi.org/project/ggtools/1.1.0/)[@ggtools] and [`shxarray`](https://github.com/ITC-Water-Resources/shxarray)[@shxarray]. General tools for spheric harmonic analysis are also available, such as [`SHTools`](https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GC007529)[@wieczorek2018shtools]. [`SHbundle`](https://www.gis.uni-stuttgart.de/en/research/downloads/shbundle) provide MATLAB scripts for Spheric Harmonic Synthesis and Spherical Harmonic Analysis. The first version of the code was developed in 1994 while the latest version was released in 2021.
