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Combining Histograms of Multiple Tests

I am trying to plot the histogram of difference of Vout from two different tests under the same Monte Carlo runs. It is similar to this post Combining Histograms of Multiple Tests? - Custom IC Design - Cadence Technology Forums - Cadence Community.

1st Attempt:

Expression

histogram2D(list(_statGetWaveform("vout_cm" nil ?resDbFile axlGetHistoryResults(axlGetCurrentHistory(_vivaGetSessionName())) ?testName "TEST1" ?filtPointsList "" ) _statGetWaveform( "vout_cm" nil ?resDbFile axlGetHistoryResults(axlGetCurrentHistory(_vivaGetSessionName())) ?testName "TEST2" ?filtPointsList "" ) ) 10 "standard" "stddev" t t )

Result

Error

2nd Attempt:

Expression

_statGetWaveform("vout_cm" nil ?resDbFile axlGetHistoryResults(axlGetCurrentHistory(_vivaGetSessionName())) ?testName "TEST1" ?filtPointsList "" )

Result

Valid data not found for "vout_cm", check expression and/or filter settings.
ERROR (VIVA-3002):expression evaluation failed: Expression evaluates to nil
ERROR (VIVA-3002):expression evaluation failed: _statGetWaveform("vout_cm" nil ?resDbFile axlGetHistoryResults(axlGetCurrentHistory(_vivaGetSessionName())) ?testName "TEST1" ?filtPointsList "" )

3rd Attempt:

Expression

_statGetWaveform(v("vout_cm" ?result "dcOp") nil ?resDbFile axlGetHistoryResults(axlGetCurrentHistory(_vivaGetSessionName())) ?testName "TEST1" ?filtPointsList "" )

Result
ERROR (VIVA-3002):expression evaluation failed: val is not legal.
ERROR (VIVA-3002):expression evaluation failed: _statGetWaveform(v("vout_cm" ?result "dcOp") nil ?resDbFile axlGetHistoryResults(axlGetCurrentHistory(_vivaGetSessionName())) ?testName "TEST1" ?filtPointsList "" )

Note

I already selected Save Simulation Data and the results browser is showing these values.

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