I made a python script that automatically runs PCALY broadband injections then DARM OLG measurements for the purpose of quickly measuring the DARM plant.  This was used to measure the DARM plant several times overnight during a SR3 heater move to find that turning on the SR3 heater gives H1 a DARM prospring.

Jeff K expressed interest in this script, so it now it lives in the cal SVN.
To measure the DARM plant using this script, go to NLN_CAL_MEAS, open a terminal and run:
python /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Scripts/FullIFOSensingTFs/autoBroadband/PCAL_and_DARM_BB_injection_caller.py

Both the PCAL and DARM injections take 83 seconds each.  The subsequent MCMC fitting and plotting takes about two minutes.
It will save data timeseries, ASDs, and TFs in /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Measurements/FullIFOSensingTFs/autoBroadband/{date}/.
Plots will be in /ligo/svncommon/CalSVN/aligocalibration/trunk/Runs/O3/H1/Results/FullIFOSensingTFs/autoBroadband/{date}/.

Posted below are the three plots this script produces from a injection tonight at around 3:30am this morning (2019-03-28 10:30:28.000000 UTC):
1) The DARM plant with an MCMC fit
2) DARM OLG
3) CAL DELTAL / PCAL comparison

As far as the DARM plant goes, the prospring frequency seems to have increased to about -5 Hz according to the fit.  The fit is not great since the data is not great at frequencies before 10 Hz: it is difficult to drive hard enough with the PCAL to resolve the prospring.
I have tuned a low frequency PCAL BB injection for future attempts at resolving the spring as well as the swept sine did earlier today.  This is not yet a part of this script.
We would like to try to move the SRCL offset and see if we can control the prospring frequency.  This may have a direct impact on our range.  This script will make a quick turnaround of the spring frequency possible.