Hello At Ease,
Can you attach the PDF, the link is passworded.
The graph you presented has
The X axis labeled in Meters / Second rate of climb
The Y axis labeled in Thousands of Meters of altitude
Thus Sea Level climb is around 9.7 meters / second
Climb at 2,000 Meters is around 10.5 meters / second
Climb at 7,700 Meters is around 6.5 meters / second
Climb falls to zero at 11,000 meters.
That is how I read the graph. YMMV.
- Ivan.