Undefined regions of Dichroic spectra produce zero transmission.

[iandobbie]

Not sure if this is a bug or a feature. I have a spectra for a Lumencor specific dichroic on a Nikon Sora system with a Ziva 7 line laser source. The tripple dichrocis is obviously designed for excitation with the 440 nm laser lines of this source buit the dichroic spectrum only starts at 450 nm. When I load this into spekcheck the undefined region means that I get 0 transmissioj of the 440nm laser so no excitation.

The dichroic in question is the tripple at
https://lumencor.com/products/accessories/dichroic-mirrors-and-filters

I am not sure if this should just be documented, assume the transmission is zero where it is not defined (making the reflection 100%, not real but probably close to the case in use here) or maybe some code to indicate the significant portion of the spoectra was in an undefined region.