`\documentclass[11pt,a4paper]{report}
\usepackage[italian]{babel}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{indentfirst}
\usepackage{siunitx}
\usepackage{graphicx}
\usepackage{subfigure}
\usepackage{wrapfig}
\usepackage{booktabs}
\usepackage{multirow}
\usepackage{colortbl}
\usepackage{syntonly}
\sloppy
\usepackage[Bjornstrup]{fncychap}
\usepackage{fancyhdr}
\pagestyle{fancy}
\begin{document}
\begin{table}[ht]
\centering
\footnotesize
\newcolumntype{G}{>{\columncolor[gray]{0.8}}c}
\begin{tabular}{ccccccG}
\toprule
\multirow{2}*{satelliti} & \multicolumn{5}{c}{Parametri} & \cellcolor[gray]{0.8}\multirow{2}*{Altitudine media} \\
& A & B & C & D & E & \\
\cmidrule(l){1-7}
4 & 2 & 1 & 4.29 & 5 & 1.02 & 45.9 \\
\bottomrule
\end{tabular}
\caption{Costellazioni}
\end{table}
\end{document}
`