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# A.11 x_system: Track crossover error estimation

This package contains the tools x_edit, x_init, x_list, x_over, x_remove, x_report, x_setup, x_solve_dc_drift, and x_update. Collectively, they make up the old ``XSYSTEM'' crossover tools. This package with remain in the GMT supplemental archive until x2sys is complete. The package is maintained by Paul Wessel.