It would been simpler if they were stored in a cell array:
c{1} = outlier & incl_p;
c{2}= outlier & incl_r;
c{3} = outlier & incl_p_r;
Note: Naming variables is a bad idea ( https://in.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval ). Loop through c to get three different figures with a figure call.