You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: pspm_sf_scl.m
    path of file: ./repos/PsPM/src
    
    the code of the file until where you have to start completion: function varargout = pspm_sf_scl(model, options)
% ● Description

    
function varargout = pspm_sf_scl(model, options)
% ● Description
%   pspm_sf_scl returns the mean skin conductance level for an epoch
% ● Format
%   auc = pspm_sf_scl(scr, sr)
% ● Arguments
%       scr:
%        sr:
%   options:
% ● Outputs
%       scl:
% ● References
% ● History
%   Introduced In PsPM 3.0
%   Written in 2008-2015 by Dominik R Bach (Wellcome Trust Centre for Neuroimaging)
%   Maintained in 2022 by Teddy Chao (UCL)

% initialise
global settings
if isempty(settings)
  pspm_init;
end