You will be shown an excerpt from a computer science scientific research paper, followed by a question about the paper. Please answer the question. Do not include any text in your response other than the answer.

Context: In practice, the above algorithm can often converge to a point on the zero level set \mathscr{F}. In order to reach the other side of the classification boundary, the final perturbation vector \hat{\bm{r}} is multiplied by a constant 1+\eta, with \eta\ll 1. In our experiments, we have used \eta=0.02. 

Question: What is the value of η used by the authors in experimentation?
The perturbation constant that is used is n = 0.02.