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                if matrix is None:
                    # Compatibility with older note format
                    matrix = np.eye(3,3)
...
                points = np.concatenate((points, np.ones([points.shape
+[0],1])), axis=1)
                points = points @ matrix.T
                points = points[:, :2]

#!/usr/bin/env perl

use v5.38;
...

    croak("Note not found in ". $fname);
}