ReadonlyarrivalArrival time, ms, RELATIVE to the direct arrival. Always positive: earlier local maxima are part of the direct peak's own main lobe, not a second arrival.
ReadonlydistanceThe extra path length past the direct sound, metres, at 343 m/s — arrivalMs x 0.343.
ReadonlylevelLevel, dB, relative to the direct peak (always <= 0 by construction: the direct peak is the envelope's global maximum).
One named reflection — spec §3b's table, one row.