TL431: PSPICE model

Tool/software:

Hi team, 

My customer is using below PSPICE model for simulation. But they found it is 4 pins package which is different with datasheet package. You can find the screenshot as below. 

I don't see 4 pins package in datasheet, so could you please provide the pin description of this 4 pin model? 

Thanks!

Ethan Wen