Do we see bright blue spots at double their original wavelength, i.e., in red

We are looking into the possible reasons for the larger than expected drop in observed flux on the blue detector. As one possible diagnostic, look if there is any hint of bright blue arclines being observed at double their original wavelength in red. 

The code is at: 

/home/ncaplar/Pipeline_notebooks/PIPE2D-942 (blue spots seen in red).ipynb