1. A plot of transistor base current (IB) against the voltage between base and emitter (VBE), for various fixed values of the voltage between collector and emitter (VCE) in a common-emitter configuration.
2. A plot of transistor base current (IB) against the voltage between collector and base (VCB), for various fixed values of the voltage between collector and emitter (VCE) in a common-collector configuration.