M. Barton, J. Kissel. O. Patane

Recall, we'd had issues understanding why the modeled top-mass pitch to pitch transfer function looked so weird (see LHO aLOGs 75787 and 75947).

After 
    - Mark's suggestion of the problem (suggested over email and mentioned on the 2024-02-29 a+ SUS call), and
    - Oli's hard work proving that that *was* the problem (see LHO:76071), 

I've now closed the loop for the bbssopt.m Bigger Beam Splitter Suspension's production model parameter set that best matches the first article data:
    - Added a few more slides to G2400442 conveying the resolution, now at -v2
    - copied over the temporary bbssopt_pendstage2on_d1minus2p5mm_d4minus1p0mm.m parameter set on top of bbssopt.m parameter set,
    - committed bbssopt.m to the SusSVN as of rev 11778.

The screenshot of the comparison shows the differences between the previous rev and the current rev:
    - the pend.stage2 boolean flag is now set to 1.0, which matches that the ds are defined as physical ds, and
    - d1 and d4 are (slightly) adjusted to better match the first article.

To generate transfer functions from this production model parameter set, 
    (1) find a computer with the 
    /ligo/svncommon/SusSVN/sus/trunk/Common/MatlabTools/TripleModel_Production/

folder checked out, 
    (2) open Matlab, 
    (3) Run the following commands:
        >> freq = logspace(-2,2,1000);
        >> buildType = 'bbssopt';
        >> svnDir = '/ligo/svncommon/SusSVN/sus/trunk/';
        >> plotFlag = false;
        >> [bbss,~,~,pend] = generate_Triple_Model_Production(freq,buildType,svnDir,plotFlag);
        >> figure(1);
        >> ll=loglog(freq,abs(squeeze(bbss.f(bbss.out.m3.disp.L,bbss.in.gnd.disp.L,:)))); %%% Chose which DOF you want to plot here
        >> set(ll,'LineWidth',2);
        >> grid on;
        >> title('BBSS Susp. Point. L to Optic L');
        >> xlabel('Frequency [Hz]'); ylabel('Magnitude [m/N]')
        >> shg
which will produce the attached plot.