Writing an EEGLAB plugin

In the GUI

1. File › Load existing dataset
2. Plot › Channel varianceOk ← 3

Script

eeglab nogui
eeglabRoot = fileparts(which('eeglab'));
EEG = pop_loadset('eeglab_data.set', fullfile(eeglabRoot, 'sample_data'));
assert(exist('pop_chanvar', 'file') == 2, 'pop_chanvar not found: check the plugins folder');
com = pop_chanvar(EEG, 3);
disp(com);   % pop_chanvar(EEG, 3);
eval(com);

Which value should I choose?