i've added a PUFA% column and color-coded it against the "not to exceed 12%" standard. i've not bothered color-coding the mg/100 g column. i have color-coded the fat names themselves, which at this point is just my personal opinion of the fat, taking into account the other columns.
|n3:n6 ratio||mg n3/100g||mg n6/100g||PUFA tot%|
|butter||1:6.9* / 1:1.6**||802||1244||4|
* for butter and lard, i suspect these ratios are actually a little more favorable in my household, since we source these from pasture-fed animals.
** the second calc'ed ratio is from the two non-colored columns, which was different enough from the other value for me to include both. the first ratio is from the Corbain data, the second is calc'ed from the data i retrieved from nutritiondata.com. I believe the source of the data is the same (that USDA database), but I reckon we used two different butter entries.