/usr/share/psychtoolbox-3/PsychCalDemoData/Contents.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | % Psychtoolbox:PsychCalDemoData.
%
% help Psychtoolbox % For an overview, triple-click me & hit enter.
% Also see PsychCal.
%
% This folder holds calibration data for the Psychophysics Toolbox.
% The calibration files here are for "typical" monitors, not for
% yours. If you write a calibration file, we recommend putting
% it in a folder "PsychCalLocalData, placed outside of the
% "Psychtoolbox" folder but on Matlab's path. The LoadCal and
% SaveCal routines will read and write to the local folder first,
% and if you create one it will not get overwritten when you
% install a new version of the toolbox.
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