LT3045, LT3045-1, LT3094 - difference between grades E vs I?

Hello,

May I ask what differences there are between the E and I grades of the LDOs in the subject? I believe these letters normally refer to different temperature ranges, but for these ICs the datasheets specify the same ranges for these grades. However, there appears to be a considerable difference between their prices. What am I missing? If the grade letters have some formal definition somewhere, could someone point me to it, please? (My Google searches didn't turn up anything relevant.)

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