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What does the "E" in Tiva TM4E1231 mean?

Does anyone know the difference between a TM4E1231 and a TM4C1231 Tiva Microcontroller (i.e., what does the "E" mean)?  

I see references to the TM4E1231 being supported in the software tools but no other information about it ... but I know it is used on products.