EPR u-domain

Show the \(u\)-domain in EPR.

We use this to demonstrate:

• setting the defaults for FT shift vs. not

• units that appear OK in the plot, even when the initial domain is frequency and conjugate is inverse domain

• successful convolution, even with really weird FT startpoints

• 
• 

----------  logging output to /home/jmfranck/pyspecdata.0.log  ----------
1: initial spectrum |||mT
2: u-domain |||kcyc/T

import pyspecdata as psd
import re

psd.init_logging(level="debug")
Bname = "$B_0$"
d = psd.find_file(re.escape("220307_S175_KCl.DSC"),
                  exp_type="francklab_esr/Farhana", zenodo="21084153")
d.chunk_auto("harmonic")
d = d["harmonic", 0]["phase", 0]
d[Bname] *= 1e-4
d.set_units(Bname, "T")
d.set_ft_initial(Bname, "f").set_ft_prop(Bname, "time_not_aliased")
with psd.figlist_var() as fl:
    fl.next("initial spectrum", figsize=(3 * 1.618, 3))
    fl.plot(d)
    fl.next("u-domain", figsize=(3 * 1.618, 3))
    d.ift(Bname)
    fl.plot(d)
    fl.next("initial spectrum")
    d.ft(Bname)
    d.convolve(Bname, 3e-4, enforce_causality=False)  # smooth by 1 G
    fl.plot(d)
    fl.next("u-domain")
    d.ift(Bname)
    fl.plot(d)