filter ripple specified in nm, not dB?

I'm looking for some ITU G694.2 filters to use in an upcoming project, and found an inexpensive one:

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{12}72{9}22{6}56 The ripple is listed in nm, rather than in dB over the pass band. I'm not sure what the nm indicates.

The specs also don't mention peak IL; only maximum IL. If anyone has comments on this unit, or can point me towards a stronger source of connectorized G694.2 grid filters, I'd appreciate it.

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