Signature of an L-function (reviewed)

The signature either refers to the pair $[J,K]$ where $J$ is the number of $\Gamma_{\mathbb R}$ and $K$ is the number of $\Gamma_{\mathbb C}$ in the Selberg data, or else it refers to the tuple $$ (\Re(\mu_1),\ldots,\Re(\mu_J); 2\Re(\nu_1),\ldots,2\Re(\nu_K)). $$ Note that the entries in that tuple are non-negative integers.