[GiNaC-list] how to drop terms in expression with small coefficients?

Hi. I have the following problem - I have a polynomial P(x) and before I proceed with some calculations on it, I want to make sure it does not contain terms like for example: 10e-12 * x (in my case x is from (0, 1) so this is safe). I want to somehow get rid of such small terms. In another words for polynomial P(x) = 2.3 * x ^ 2 + 10e-12 * x + 3.76 I want to obtain polynomial Q(x) = 2.3 * x ^ 2 + 3.76 How do I do that i GiNaC? Please, help. I will kindly appreciate any advice. Kind Regards, Tomasz.