X-axis in plot not reading from T.wavelength_nm?

[aeropung]

Using the example posted here, I'm trying to find the spectral transmission for a well-known RF regime; let's say 1 GHz- 1.5 GHz. In wavelength, these convert to 299792458 and 199861639 nm, respectively.

Adding these wavelengths, the code becomes:

p = ArgumentParser(description="Lowtran 7 interface")
p.add_argument("-z", "--obsalt", help="altitude of observer [km]", type=float, default=0.0)
p.add_argument(
    "-a",
    "--zenang",
    help="observer zenith angle [deg]",
    type=float,
    nargs="+",
    default=[0, 60, 80],
)
p.add_argument("-s", "--short", help="shortest wavelength nm ", type=float, default=199861639)
p.add_argument("-l", "--long", help="longest wavelength cm^-1 ", type=float, default=299792458)
p.add_argument("-step", help="wavelength step size cm^-1", type=float, default=20)
p.add_argument(
    "--model",
    help='0-6, see Card1 "model" reference. 5=subarctic winter',
    type=int,
    default=2,
)
P = p.parse_args()

c1 = {
    "model": P.model,
    "h1": P.obsalt,
    "angle": P.zenang,
    "wlshort": P.short,
    "wllong": P.long,
    "wlstep": P.step,
}

TR = lowtran.transmittance(c1)

transmission(TR, c1)

show()

But when I run the code, I get the following plot:

Notice that the wavelength range (see question from #28 ) is 199,861,639 - 299792458nm, but the X-axis on the plot only shows a range of 0e6 - 10e6, or 0 - 10,000,000 nm -- a factor of 20 shorter than the shortest wavelength specified in the code. How can I make sense of the output data if I cannot trust the plot? How do I interpret the output?

Further inspection suggests that 10e6 nm is the longest wavelength that can be plotted, even though LOWTRAN 7 is programmed to work from 0 - 50,000 cm^-1, or 200 - Infinity nm. Furthermore, extracting the plotting wavelengths reveals the limitation as well:

>> TR.wavelength_nm.values
array([9999998.,       0.], dtype=float32)

Why is this artificially limited?