Input characteristic curve of common collector configuration

I am really new to electronics and BJT. I would like to know why is the input characteristic curve of common collector configuration [Ib-Vbc] is different from other 2 input characteristic curves. What actually accounts for this difference?

update:

@jippie the input characteristic curve of common emitter configuration is as follows:

enter image description here

but the input characteristic curve for a common collector configuration is :

enter image description here

can I know what actually causes this difference?

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