function [sample] = tsg_diffTsgSample(tsg, psal_smooth, sample)
%
% function [sample] = tsg_diffTsgSample(tsg, psal_smooth, sample, dt)
%
% Co-location of bucket and TSG measurements
% Compute the bucket-TSG difference
%
% tsg ........... structure of TSG data
% psal_smooth ... smooth TSG timeseries
% sample ........ structure of samples
%

[m, n] = size(sample.SSPS);

% time difference between 2 succesive TSG measurements
% ----------------------------------------------------
dt = tsg.DAYD(2) - tsg.DAYD(1);

% Loop on the samples
% -------------------
for i= 1 : m
    
    % Indice of the TSG measurement the closest to the sample
    % --------------------------------------------------------
    timeDiff  = abs(tsg.DAYD - sample.DAYD(i));
    
    [timeMin, indMin]  = min(timeDiff);

    if  timeDiff(indMin) < dt && ~isnan(psal_smooth(indMin)) 
    
        sample.SSPS_SMOOTH(i)  = psal_smooth(indMin);
        sample.SSPS_QC(i)      = 1;      
    else
        sample.SSPS_QC(i)      = 0;      
    end
end

% Salinity difference : Sample minus smoothed TSG
% -----------------------------------------------
indSample = find( sample.SSPS_QC == 1 );
sample.SSPS_DIF(indSample) = ...
                    sample.SSPS(indSample) - sample.SSPS_SMOOTH(indSample);