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REF3425: REF3425 error question

Part Number: REF3425

Hi, I have a REF3425 question of the following link guide P6, 

1.For emperature Drift (TempCo), GAIN ERROR VALUE(-40℃ to 125℃) =990, why  is the max gain error value not from 25℃ to 125℃? 

2.how to calculate the "RSS Total with 25C Calibration" and "RSS Total with 25C & TempCoCalibration", do you have the formula.

Voltage Reference Design Tips For ADC Pairing (Rev. A)

pls help to check, thx very much.