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Since base is narrow and collector is heavily doped with respect to the base, current can flow in the collector circuit though collector-base diode is reverse bias. The amount of collector current depends on how well base-emitter junction is forward bias. Thus large the forward bias VBE and the base current IB, larger will be Ic  for a given Vcc.

Hence output or collector characteristics curve is drawn for Ic—->VcE for different values of IB

(Click on the following image for more explanation)

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