[jti107]

seems like they are looking in multiple bands hence the 4 spatial dimensions

"Our approach differs from previous work by combining 3D and spectral super-resolution simultaneously with readily available fluorochromes as well as operating in a wavelength range where biological autofluorescence is minimised."

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3105105/

[dekhn]

No, 4D space. Like, you can go forward and back, left and right, up and down, and yimlo and olmiy. We don't have yimlo and olmiy here but I'm sure somebody in 4-space is reading a copy of "Flatland" right now.

The problem wouldn't make sense if you're treating wavelengths as dimensions (and is a far easier problem).