Hi all. Hope someone can help me out with this query: Nonprofit organizations's 990 form section VII lists executive salary in 3 columns - reportable compensation from the org, reportable compensation from related orgs, and estimate other compensation from the org and other orgs.  Can you discern between the 3? 

Picking on a random nonprofit, the CEO of Mount Sinai Hospital has reported income of $1,918,387 from the organization, $3,671,318 from related organizations, and $68,724 estimated other compensation.  What is the difference between these three figures? Ignoring how/why a nonprofit CEO's salary is over $5 million, what is the difference between the first $1.9 million and the other $3.6 million?

Thanks in advance!!