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I have the next expression and I don't know what exactly mean the commands

a= dexp ((const1)* (b-298) / (b*298))

This one, I guess it's to calculate the exponential value of the expression giving a double precission.

But i didn't find any info about the command expg,

i.e: a = const1 + const2 * expg( const3 * b(2+const4,j) / const1)

Is it expg other form of exponential or it's a variable that i'm missunderstanding?

Thanks in advance