Clock pulse shape

We measured the clock shape for different settings of the duty cycle, probing internally on the chip.
 
The clock signal was measured on 4 different internal probe pads on the chip: clk_ap, clk_am, clk1 and clk2.
The positive duty cycle was measured for different setting of the external clock.  The duty cycle values labeled
'pulser' are the values set on the external clock, not measured values at the input to the chip.  The duty cycle.
was measured at the 50% point (as indicated aprox. with an arrow).