\newcommand{\grl}{Geophysical Research Letters}
\newcommand{\icarus}{Icarus}
\newcommand{\planss}{Planetary and Space Science}

\newcommand{\nat}{Nature}
\newcommand{\apj}{Astrophysical Journal}
\newcommand{\jgr}{Journal of Geophysical Research}
\newcommand{\aap}{Astronomy Astrophysics}
\newcommand{\apjl}{Astrophysical Journal}
\newcommand{\ao}{Applied Optics}


\newcommand{\deg}{deg}