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<@U01819B63HP> In below testbench, W and L of nmos are varied using alterparam. I wanted to plot drain current `i(v1)` for for different W and L values hence used `i(v1)%1` to plot separate sweeps but it seems not giving desired plot.

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Remove all set appendwrite lines and write each dc simulation into a different file, like test_nmos_sizes1.raw, test_nmos_sizes2.raw, ...
then you can display i(V1) for different files, see example below:

I don't understand this question:
&gt; Also is there any option to see separate X-axis values of drain current `i(V1)` with swept `vd` values in waveform as seen in above screenshot.
What do you want to do?

While using marker on graph, can Y-axis values of each swept curve be available for particular X-axis value. For example, For vgs=1V want to see Ids value for all swept vds values in graph.

multiple_waves_measurement.mp4

You can isolate a specific curve and see the current value, see video.

You can also display multiple curves, one per dataset using the syntax in below image. In this case all waveforms will have annotated values...

Thanks <@U01819B63HP> for these solutions