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gra_command()
Executes any Spectra command:
Spectra.gra_command("create test 0 10 100")
Spectra.gra_command("display")
Notice that gra_command() can also be used to transfer information
to Spectra by setting a symbol:
result = 1.2345
cmd = "return_value = %g" % result
Spectra.gra_command( cmd)