Feature/td nirs snirf#1
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Add support for time-domain NIRS data types including: - TD gated histograms (fnirs_td_gated_amplitude) - TD moments (intensity, mean, variance) - Processed hemoglobin data (HbO/HbR) Updates constants, channel picking, covariance, defaults, and the SNIRF reader/tests to handle these new data types.
The old files (Portal_2021_11) don't conform to the SNIRF spec — they store HbO/HbR in micromolar without declaring dataUnit. Rather than adding heuristics, remove these tests. The files can be fixed upstream by adding a proper dataUnit field to the HDF5.
Check shape, channel type, photon count range, and that channel metadata (wavelength, time_delay * width) are populated.
TD gated channels measure photon counts from single-photon counting detectors, not voltages. Use FIFF_UNIT_UNITLESS (matching fnirs_td_moments_intensity) instead of FIFF_UNIT_V.
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Reference issue
this is an update to mne-tools#11064
What does this implement/fix?
Additional information
N/A