Some plots (PDF):
Elevation profile and air temp, distance base 10 kb
My climb rate and profile, time base 10 kb
My speed (slow), distance base 10 kb
Gradient and profile, distance base 10 kb
The elevations in these are all off by about 200 feet.
Since I didn't reset the altimeter.
I think Mark H. turned back at about mile 17.3
Raw data spreadsheet 122 kb
Grade and climb rate based on elevation gain in 6 minutes
includes plots:
Processed data spreadsheet 296 kb