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Level 1

I need to be able to input scientific notation in numeric fields for my adobe forms.  I can put the pattern to num{9.99E} and it will allow me to put positive exponents and negative exponents to -3.  However, I need to input the number 4.76E-19 and it always changes it to 0.00E0.  What kind I do to keep this small of a number as 4.76E-19?