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RF sensitivity meaning in ADF4156 datasheet

Regarding the ADF4156 datasheet, according to table 1, the RF IN (for single pin or for both pins combined??) require/s power between -10dBm to 0dBm.

According to figure 5, it seems the RF power required is below -15dBm all over the usable range (I probably did not understand the meaning of "RF sensitivity" there).

What is my understanding mistake?