mmore minor

                    rcMap = reshape(rcMap,[2,numel(rcMap)/2]);

                else %% learn common set of regressors for all channels (default)

                    %% perform tCCA with shrinkage for all fNIRS channels

                    [REG,  ADD] = rtcca_dummy(d_long,AUX,param,flags);                 %% save and output tCCA filter.

                    [REG,  ADD_trn] = rtcca(d_long,AUX,param,flags);                 %% save and output tCCA filter.

                    %reduce filter matrix with the help of correlation threshold or max number of regressors

                    if ctr < 1

                        % use only auxiliary tcca components that have correlation > ct

                    % return the reduced number of available regressors

                    Aaux{iBlk} = REG(:,compindex);

                    % return reduced mapping matrix Av, this is the tCCA filter

                    tCCAfilter = ADD.Av(:,compindex);

                    tCCAfilter = ADD_trn.Av(:,compindex);

                    % set channel-regressor map to empty (GLM will use all available regressors for all channels)

                    rcMap{iBlk} = 'all';

                end