HMC8100 Receiver IIP3

In the datasheet, IM3 (dBc) graphs are provided against RF input power (dBm) for internal AGC mode. My questions are:

1) IM3 unit is dBc in datasheet. Is this relative to input carrier or output carrier?

2) I actually want to deduce IIP3 or OIP3 for the IC in internal AGC mode. KIndly help me out