[lotsofmangos]

If you read the text, it tells you that the 850nm was always visible.

[gus_massa]

I reed the previous version of this URL. IIRC it has the same graphs, but the text was much shorter, and didn't explain that. Replace 850 with 950 in my comment. The article now says that 950nm was not visible, but they don't link to the graph.