After reading the aforementioned document, I have a question for you: Is the CTE table you provided Instantaneous CTE values or are they Secant CTE values, and if they are Secant CTE values, what is the reference temperature?
If you know the table to be Instantaneous CTE values, use equation (4) in the document to convert to Secant CTE at the reference temperature of 20 C that you mentioned for the zero strain temperature.