NORAD opacities should be smoothed by default

Hi,

I've only recently taken a look at the continuum returned by korg, and I am seeing some strange features in the blue(see below) which seem to be at the level of a percent, but look like artifacts/numerical issues to me:

This is obtained using latest 1.2.1 korg (from python). The stellar parameters here teff=4000,logg=5, and abundance corresponding to feh=-1,alpha=0 (I don't think this matters too much).

This is what I do:
```
X_H = np.array([ 1.200e+01, 1.093e+01, 5.000e-02, 3.800e-01, 1.700e+00,
7.390e+00, 6.780e+00, 7.660e+00, 3.560e+00, 6.840e+00,
5.170e+00, 6.530e+00, 5.370e+00, 6.510e+00, 4.360e+00,
6.140e+00, 4.500e+00, 5.180e+00, 4.080e+00, 5.310e+00,
2.170e+00, 3.900e+00, 3.000e+00, 4.640e+00, 4.390e+00,
6.450e+00, 3.920e+00, 5.230e+00, 3.210e+00, 3.600e+00,
1.880e+00, 2.580e+00, 1.290e+00, 2.330e+00, 1.560e+00,
2.250e+00, 1.600e+00, 1.920e+00, 1.210e+00, 1.580e+00,
4.200e-01, 9.200e-01, -6.000e+00, 8.400e-01, 1.200e-01,
6.600e-01, -6.000e-02, 7.700e-01, 6.000e-01, 1.000e+00,
0.000e+00, 1.190e+00, 5.100e-01, 1.240e+00, 7.000e-02,
1.170e+00, 1.300e-01, 7.000e-01, -4.200e-01, 4.500e-01,
-6.000e+00, 0.000e+00, -4.800e-01, 1.100e-01, -7.200e-01,
1.400e-01, -4.900e-01, -7.000e-02, -1.000e+00, 8.000e-02,
-9.400e-01, -1.200e-01, -1.170e+00, 1.100e-01, -7.700e-01,
2.500e-01, 3.800e-01, 6.400e-01, 1.000e-02, 1.300e-01,
-1.000e-01, 1.000e+00, -3.500e-01, -6.000e+00, -6.000e+00,
-6.000e+00, -6.000e+00, -6.000e+00, -6.000e+00, -9.400e-01,
-6.000e+00, -1.520e+00])
marcs = Korg.interpolate_marcs(float(4000),
float(5),
X_H,
clamp_abundances=True)
spec0 = Korg.synthesize(
marcs,
lines,
X_H,
(3100, 4000),
vmic=1,
line_buffer=100,
hydrogen_line_window_size=400,
cntm_step=0.1,
)
plt.plot(spec0.wavelengths, spec0.cntm)

```

lines variable is my VALD line-list (but presumably that shouldn't matter for the continuum).

Are the features that I am seeing an issue, or it is somehow expected from bf, etc ?

Thanks!