Allison the formula is your net acres divided by total acres in the section times your decimal royalty ie. 3/16=.1875 1/8=.125. A section is usually 640 acres, so if it’s a 1280 acre unit you only get your share of production from the section you own in. I’m not clear on the 320 acres, is that your total ownership or was the unit originally spaced as 320 Acres?