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LT3471 - Calculating C6 For SW2 Output

The LT3471 datasheet discusses calculation of Cpl for the SW1 output on pages 7 through 8 of the datasheet.  Figure 2 on page 8 of the datasheet shows Cpl with a value of 33pF (presumably calculated as discussed on pages 7 and 9 of the datasheet based on the R3 value of 90.9k).  However, C6 (in parallel with R1 with a value of 105k) in Figure 2 on page 8 of the datasheet, and the calculation thereof, is not discussed in either the datasheet or the eval board manual.  How is the value of C6 (75pF in Figure 2) calculated?