What is the shear transfer coefficient for open and close crack of reinforced concrete?

What is the shear transfer coefficient for open (C1) and close crack (C2), respectively, of reinforced concrete? This is used in TBDATA for material Solid65. 

As far as I know, for both types of cracking, 0 means no shear transfer, 1 means full shear transfer. C1 means there is cracking, C2 means when the concrete does not have any cracking. Do I understand it correctly? If not, please tell me.

 

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