sk yandte s kl eysacnodpt e .l e o sr gc o*p eS.Eo P r gT E*MJB UELY LR Y 2020 17 VOYAG E R 1 C RO S S I N G : M . SW I S DA K E T A L . / ASTRO PH YS ICA L JOU R N A L L E T TE RS 774 :1 (2 013 )