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/usr/share/psychtoolbox-3/Psychometric/LogToDb.m is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.

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function dbUnits = LogToDb(logUnits)
% dbUnits = LogToDb(logUnits)
%
% Convert from log units to decibels.
%
% 1/5/95		dhb		Wrote it.

dbUnits = logUnits*20;