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Lt3571 bias

Category: Hardware
Product Number: LT3571


I am trying to design APD bias using LT3571. Whose Vapd would be 55V. Temperature variation for the APD which I am using is 56mV/degree Celsius. In the document(pls refer the link), values of resistors R5-R9 are given for 100mV/degree Celsius. What will be the value of resistors for 56mV/degree Celsius. 

Equations are given in the document, but R7/R8 is linked to Vref. How to calculate that Vref??