ahramin . . . .
Otterman's point is: The ATIS temperature at airport XYZ taken from a centrally located meterological measuring unit is reported as 22c. But captain Otterman's airplane is at the far side of the airport where he argues that the "real" temperature realistically could be as much as 2c lower, because of this and that . . . and that if only the "official" ATIS airport temperature were correctly reported in the immediate vicinity of his airplane and on his departure runway, then it would be 20c and he could have taken another 1500kgs of cargo.