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Two measurements are to be used to calculate parameters such
as IACC and LF. This can be done in Calculate->Calculation Options… as
shown below where we have selected the microphone type Omni-directional and
fig-8 that is used for the LF parameter. If you want to calculate IACC
instead of lateral fraction, select the 
microphone type(s).
Above we see that Meas.2 is selected as Omni mic and Meas.3 is selected as Fig-8 mic.
When doing this, the primary measurement (omni-directional mic.) is the active measurement in the upper plot and the secondary measurement (figure-of-eight mic.) is set to be the active measurement in the lower plot. The active measurement in the lower plot can also be found and set from the Measurement Selection Toolbar as shown below
Limitations when plotting parameters needing two measurements
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