François Pantigny submitted an update to the
nicematrix
package.
Version number: 5.18 2021-07-15 License type: lppl1.3
Summary description: Improve the typesetting of mathematical matrices with PGF
Announcement text: ----------------------------------------------------------------------
New command RowStyle to fix formatting instructions for the whole row.
New optional arguments _ and ^ for subscripts and superscripts of the command SubMatrix.
Correction of several small bugs. ----------------------------------------------------------------------
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Thanks for the upload.
For the CTAN Team Ina Dau