Digital BW, The Print

1160
MIS sepia>neutral
Paul's curve's
0-100% step tablet/wedge

A group member emailed me a 100 step tablet (he can volunteer 
himself :-) which I've printed with the Neutral curve.
Examining it closely, I've identified 6x  spots where the adjacent 
square cannot be distinguished at all from it's 'lighter' neighbour.
these are 58/59%, 67/68%, 78/79%, 85/86%, 87/88%, 92/93%  

Now I need help on how to alter the curve - loading the curve on an 
adj. layer (on any rgb image), I can Ctrl tab or Shift Ctrl tab up 
and down the curve points on the curve and even enter the Input 
number manually between 0-256 and then I can raise/lower the Output 
number.
But the sep tablet i printed is in 0-100% points - so how do I find 
the flat points - how to convert them to the input and then output 
number(58/59%, 67/68%, 78/79%, 85/86%, 87/88%, 92/93%) ?

Hope I'm making sense ?
frankg