I'm not understanding the context here. What does coop in the values mean (4th coop, 6th coop)? Who are these salaries for, is it employees at those companies, or employees of the university?
They're 4-8 month internships depending on which program or study track you choose to pursue. A lot of Waterloo programs alternate between 4 months study/4 months internship.
My program's first coop starts after freshman year (after 2 semesters), 4th coop was after first half of 3rd year, and 6th coop was 4 months before graduation.