Napalm Area of Effect

Trying to find some data on how large an area a napalm strike would cover. I know it's a bit of a "how long is a piece of string" question, but any reference would be helpful. One anecdotal reference I have (does not indicate size of ordinance) gives roughly 40 x 150 meters?

I'm back to work on my Vietnam rules and would like to at least know how "realistic" my proposed template is....

yeah that is about right per tank the greater density of area if dropping more

Mark, thomastmcc's response fits pretty well with Darby's template for FNG.

Tom