TEMP: force spectrum to plot in pixel-space

* revert this commit once glue handles non-linear wavelength scaling

jdaviz/configs/specviz2d/plugins/spectral_extraction/spectral_extraction.py

@@ -14,6 +14,7 @@
 from jdaviz.core.marks import PluginLine
 
 from astropy.nddata import UnknownUncertainty
+from astropy import units
 from specreduce import tracing
 from specreduce import background
 from specreduce import extract
@@ -880,6 +881,10 @@ def export_extract_spectrum(self, add_data=False, **kwargs):
         extract = self.export_extract(**kwargs)
         spectrum = extract.spectrum
 
+        # TEMPORARY: override spectral axis to be in pixels until properly supporting plotting
+        # in wavelength/frequency
+        spectrum._spectral_axis = np.arange(len(spectrum.spectral_axis)) * units.pix
+
         if add_data:
             self.ext_add_results.add_results_from_plugin(spectrum, replace=False)