transmission loss x-axis isn't right

[Vanillaholic]

Hi, when plotting transmission loss in a long range scenario, the x--axis went wrong

env['rx_range'] = np.linspace(0, 200000, 1001)
env['rx_depth'] = np.linspace(0, 5000, 101)

tloss = pm.compute_transmission_loss(env)
pm.plot_transmission_loss(tloss,env=env,width=900)

the attribute of tloss--columns isn't correponded to the figure ,which leads to a wrong x-coordinate.

should fix the function plot_transmission_loss() in file uwapm.py ,

def plot_transmission_loss(tloss,env, **kwargs):
    if env is None:
        raise ValueError("Environment is required")
    xr = (env['rx_range'].min(), env['rx_range'].max())
    yr = (-max(tloss.index), -min(tloss.index))
    xlabel = 'Range (m)'
    if xr[1]-xr[0] > 10000:
        xr = (env['rx_range'].min()/1000, env['rx_range'].max()/1000)
        xlabel = 'Range (km)'
    oh = _plt.hold()
    _plt.image(20*_np.log10(_fi.epsilon+_np.abs(_np.flipud(_np.array(tloss)))), x=xr, y=yr, xlabel=xlabel, ylabel='Depth (m)', xlim=xr, ylim=yr, **kwargs)
    _plt.hold(oh)

the correct result is below

all the best

[mchitre]

Thanks! Would you mind raising a PR with the proposed fix please?

[Vanillaholic]

PR has submitted

[mchitre]

PR #120