There will be at least this amount of mayor axis labels. Default: 3, 4, 5 (based on chartsize)

Integer

&CountAxisValues={Integer}

http://static.et4.de/ElevationProfileChart/Go.ashx?Experience=develop&globalid=4926A3E100ED621DA4AA7513FA6CAE88
&Width=1280&Height=720&CountAxisValues=5