Soft dB Opus Suite Building Acoustics Module Airborne Sound Isolation between Rooms ASTM E 336_ISO 140-4 - Manual (Page 22)

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Once the measurement is acceptable, press the Accept button to return to
the main interface.
7.2.1 Reverberation: Time Decay
This display shows the response to a noise interruption. It also superimposes the curves used to
evaluate the reverberation time values and the averaged successive responses.
Figure 4: Time Decay tab of the reverberation
Time Decay Graph
This graph displays the time decay curves for the selected frequency band
or global.
These buttons are used to select the visible curves on the time decay
graph. T10, T20 and T30 are the straight lines used to determine the
reverberation times. All shows all the iterations in the averaging process.
These buttons are used to display the next or previous frequency band on
the time decay graph and in the results.
This button is used to switch between frequency bands and global.
This array displays the computed results for the selected frequency band or
global.