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LM2907-N: Using Equation 6 of Data Sheet to Calculate Ripple

Part Number: LM2907-N

Hi there, I want to use equation 6 of the data sheet to verify the amount of voltage ripple in order to properly select C1, C2 and R1 for the LM907-N.  The data sheet does not specify what pk is and I cannot calculate this without knowing it. I have attached a copy of the equation for reference:

Can you please tell me what pk stands for?