We enter the Difference between Initial Observation Data (IO) and the ten minute later Observation Data (IL) (divided by 10 minutes to get the average per minute change in the size of the oil slick over the ten minute interval.)
We enter the Difference between Initial Observation Data (IO) and the ten minute later Observation Data (IL) (divided by 10 minutes to get the average per minute change in the size of the oil slick over the ten minute interval.)
Input :=
IDAve = Table[(IL[[i]] - IO[[i]])/10,{i,1,Length[IO]}]
Output =
{0.0089, 0.008, 0.0067, 0.0043, 0.0028, 0.0016,
0.0009}