To change the currently selected frame in the Profiler window, set this index to any value between and including ProfilerWindow.firstAvailableFrameIndex and ProfilerWindow.lastAvailableFrameIndex. When this property is set to a value outside of that range, or smaller than 0, Unity will throw an ArgumentOutOfRangeException.
If no frames are shown in the Profiler Window this index will be -1.
Note: Since the Profiler Window shows the current selected frame as a 1 based index, this value will be n-1 of whatever the value the Profiler Window shows.