:MARKer:Y:SOURce:SPARameter
Instrument:
                                                N1000A
                                                DCA-M
                                            Meas. mode:
                                                Scope
                                                Eye
                                                TDR
                                            Flex Apps:
                                                FlexDCA
                                                FlexRT
                                            Command Syntax
:MARKer:Y{1:4}:SOURce:SPARameter <parameter>
                                            Where {1:4} identifies one of four  markers {1:4}{A|B|C}. For example, :MARKer2B
The <parameter> argument is an S-parameter name with an underscore (_) character between the numbers. For example, the argument for an S21 parameter is S2_1.
Description
This command controls the same setting as :MARKer:X:SOURce:SPARameter command, which should be used instead to encourage consistency.  Because manual line markers cannot be placed on S-parameter waveforms, this command applies only to tracking markers.
Requires FlexDCA revision A.04.00 and above.