obtain dcmatch results units and nsigma via SKILL

I have a question about accessing the units for a dcmatch result via SKILL.    The following bit of code hopefully shows what I'm looking for.

rslt = getData("/totalOutput" ?resultsDir "/path/to/psf" ?results 'dcmatch)

printf("mean = %L <but what are the units?>" value(rslt "dcOp"))

printf("sigma = %L < but what are the units?>" value(rslt "sigma"))

Related to this, there is a parameter passed to the spectre `dcmatch` command called `nsigma` that is used when using method=statistics.  This specifies now many sigma the result is.  For example, a circuit with a 1 mV 1-sigma offset may report 0.003 in the above SKILL code if the simulation were run with `nsigma=3` instead of `nsigma=1` so `nsigma` is an important part of interpreting the results.  The units are defined in the PSF results but I don't know how to access that short of running `psf dcmatch.dcmatch` on the command line to get psfascii and parsing that.  See for example the top part of a psfascii file shown below.  "totalVariation" is defined as a struct and the result "/totalOutput" is then an instance of that struct.  

Clearly the results browser uses this because if I navigate to the `totalOutput` result I do see the units reported there.  I assume this must have come from the psf reader because the units property for the y vector of getData("/totalOutput" ...) is not set.

Regarding `nsigma` I don't even see that value in the psfascii output.  I only see it either in the spectre input file or the spectre log file.  

The reason I'm interested in these is I have various bits of code to process dcmatch results and currently I'm having to pass on the units and nsigma explicitly and it would be more convenient and less error prone to read both directly from a simulation result.

Any ideas?

Thanks

-Dan