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LT3960 I2C to CAN common mode rejection on CAN with capacitor

Category: Hardware
Product Number: LT3960


I request more explanation on the common noise filtering capacitor on page 17 of the LT3960 datasheet

How is the common mode noise is suppressed with the capacitor?  The olive line at the bottom of the graph is labelled CANSDA_CM. What does CANSDA_CM represent? Is it  0.5*CANSDAH + 0.5* CANSDAL? What is the difference between the blue and green lines of figure 11 and 12 which make such a huge impact on the CANSDA_CM?

I was expecting common mode filtering would be done something along the lines of this at page 5-13:

Please help.