Improve initial error when ensure temperature with the ADR4530 ?

Question

Hey there, 
 for a lab project where we need ultra precise voltage reference, I wanted to use the ADR4530 as ref. 
 In the datasheet it is stated that the B grade chip has initial error of 0,02% +/- . 
 Is this over the full temp range and is it improved when I can asure to keep temperature in the perfect range like in my graph below?

Thanks and best regards

GioBalgemino · Accepted Answer

Hi Stomper85 
 Yes, the test was done on full temp range. 
 Will you be using the device on the highlighted temp range? Kindly note that TC errors will add up 2ppm/&deg;C upon changing the temperature from 25&deg;C. 
 You can use this equation to estimate it 
 TCerror = TC ( T - 25C) 
 TC = temperature coefficient 
 T = Operating temperature 
 Please note that this will add up to the &plusmn;0.02 % initial accuracy. 
 
 Best regards, 
 Gio)

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Improve initial error when ensure temperature with the ADR4530 ?