  We give a precise description of spectra of the Maryland model $
(h_{\lambda,\alpha,\theta}u)_n=u_{n+1}+u_{n-1}+ \lambda \tan
\pi(\theta+n\alpha)u_n$ for all values of parameters. We introduce an
arithmetically defined index $\delta (\alpha, \theta)$ and show that for
$\alpha\notin\mathbb{Q},\,$
$\sigma_{sc}(h_{\lambda,\alpha,\theta})=\overline{\{e:\gamma_{\lambda}(e)
<\delta (\alpha, \theta) \}}$ and
$\sigma_{pp}(h_{\lambda,\alpha,\theta})=\{e:\gamma_{\lambda}(e) \geq \delta
(\alpha, \theta) \}$. Since
$\sigma_{ac}(h_{\lambda,\alpha,\theta})=\emptyset,\;$ this gives complete
description of the spectral decomposition for {\it all} values of parameters
$\lambda,\alpha,\theta$, making it the first case of a family where arithmetic
spectral transition is described without any parameter exclusion. The set of
eigenvalues can be explicitly identified for all parameters, using the {\it
quantization condition}. We also establish, for the first time for this or any
other model, a quantization condition for singular continuous spectrum (an
arithmetically defined measure zero set that supports singular continuous
measures) for all parameters.
