# :MARKer:X:SOURce:SPARameter

:MARKer Tracking Commands

- :MARKer:X:POSition
- :MARKer:X:SOURce
- :MARKer:X:SOURce:DUT
- :MARKer:X:SOURce:SPARameter
- :MARKer:X:SOURce:TYPE
- :MARKer:Y:SOURce
- :MARKer:Y:SOURce:DUT
- :MARKer:Y:SOURce:SPARameter
- :MARKer:Y:SOURce:TYPE
- :MARKer:Y:STATe
- :MARKer:REFerence

## Command Syntax

    :MARKer:XN:SOURce:SPARameter <parameter>

Where N identifies one of four {1:4} markers. For example, `:MARKer2`.

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

Use this command along with the `:MARKer:X:SOURce:DUT` command to select a tracking marker's S-parameter memory source waveform. This command selects the S-parameter. This command applies only to tracking markers and does not affect manual line markers.

## Query Syntax

    :MARKer:XN:SOURce:SPARameter?

## Parent Command

- `:MARKer:X:SOURce`