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SN54LS123: How to find the exact value of K for SN54LS123

Part Number: SN54LS123

Hi. I have a circuit containing SN54LS123 IC. I want to know the output pulse width but unable to figure out the value of K. 

The formula is PW = K * R * C

But the thing is the value of K for different capacitor is given in a Plot. I want to know exact value of K for R = 75k and C = 0.022uF.

Thank you