As Arsenal prepare to face PSG in their first Champions League semi-final since the 2009 we look at every step of the journey ...

Mikel Merino celebrates after scoring for Arsenal against Real Madrid in the Champions League quarter-final first leg.

How does it work?Thirty-six sides entered into the new "league phase" and now just four remain with a month-and-a-half to go ...

Nine wins for Arsenal, two draws and one defeat. For PSG it has been eight wins, five defeats, and one draw. Quite a difference.

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