Function amp_thresholds 

pub fn amp_thresholds(prior: &Prior, domain: Domain) -> AmpThresholds

The minimum and exact recovery thresholds of LAMA and the critical noise variances (Jeon et al., eqs. 33 and 34, Definitions 8 and 9): $\beta_{\max} = \min_{\sigma^{2}} \sigma^{2} / \Psi(\sigma^{2}, \sigma^{2})$, $\beta_{\min} = \min_{\sigma^{2}} 1/\Psi’(\sigma^{2})$; the noise variances are $\sigma^{2} - \beta \Psi(\sigma^{2})$ where $\beta \Psi’(\sigma^{2}) = 1$.