Hello, Excel experts. (I Love this forum).

I've got a file, starting in A1, like...

Start End Band Diff
1283364608 1283364735 608 127
1288347392 1288347647 608 255
1283431936 1283432447 621 511
1283448192 1283448319 621 127
1283451648 1283451775 621 127
1290457624 1290457631 623 7
1291655936 1291656191 623 255
1285583384 1285583391 624 7
1285583568 1285583583 624 15
1285587744 1285587751 624 7
1285590368 1285590375 624 7
1283250688 1283250815 625 127

Column A is the Start range.
B is the End range.
D is the Difference: simply B - A.
And Column C is what I've called Band.
The file is sorted in Band sequence.

I want to find the rows that have the greatest Difference for each Band.
Maybe with a "helper" column? I dunno'.
So, I'd end up with...
1288347392 1288347647 608 255
1283431936 1283432447 621 511
1291655936 1291656191 623 255
1285583568 1285583583 624 15
1283250688 1283250815 625 127

HOW to do this, Please?

Thanks very much.

Mark53