Spectre noise analysis output size

Hello all,

I'm running spectre from the command line (no ADE involvement) with several analyses, including noise analysis. I'm using the results from these analyses to compute a certain set of measurements, while running very large sweeps (~1000 individual points). Since I'm only interested in a small set of output measurements, I'm likewise only interested in a small selection of signals. I have therefore set up my save statements to save as few signals as possible: in fact, I have set everything to save=selected and specified the signals I'm interested in as explicit save statements.

This works fine for almost all my analyses - that is, DC, AC, STB and Harmonic Balance. They only save the signals I care about, and the output files are small. However, the noise analysis ignores these settings and saves what appears to be every voltage in the circuit. This results in output files of >100MB, when I'm only interested in the total output noise. I've been through the documentation for noise analysis, and can find no clues about why it would behave this way, unless it's for noise contribution data. I'm not interested in the noise contributors in this case, so if that is the culprit I would turn them off, but can find no way of doing so. 

Here are my analysis and save statements, with some information redacted.

noise (<output node> 0) noise start=1e4 stop=1e9 dec=20 iprobe=<probe name> annotate=no save=selected nestlvl=0

...

save <list of signal names, about 10 in total>

saveOptions options save=selected subcktprobelvl=0 currents=none nestlvl=0

My Spectre version is 23.1.0

Many thanks,

Stafford