Your format is good. However, you must use the numeric indicator in your table because you would need guide dots, and there are minus signs in the table entries. I have attached a suggestion for another way to do the tables. I'm not saying you must do it my way, or even that my way is the correct way -- I'm just showing another option. Also, this is a sequentially numbered table in a technical text, so the table label must be on line 25 of every page to which the table extends. I am open to suggestions about ways to improve my attempt. I was trying to avoid having to key the summations at the bottom of the 3rd and 4th columns.