 function outputs the system/observation matrix. Optionally in subset 
% format. This matrix can then be used anywhere. Implementation 1 only. Hasn’t 
% been extensively tested. All selected corrections are applied to the system 
% matrix.
% 
% For additional help on obtaining the system matrix, see <http://extracting_the_system_matrix.html 
% extracting the system matrix>.
##### SOURCE END #####
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