00.511.522.53-70-60-50-40-30-20-100Schroeder decay curveT20 -> T60 = 3.70 sT30 -> T60 = 3.72 stime after source stops (s)decay level (dB)T60 is extrapolated: solid is fitted, dashed is inferredSchroeder decay curvebackground noise floorT20 -> T60 = 3.70 sT30 -> T60 = 3.72 s-60 dB (never measured directly)