Astros Fans At Arlington Playoff Games

Watching on TV, video recaps and listening to the audio feed, it seems like there are a LOT of Astros fans at these Arlington playoff games. To those that have been to recent game, what is the ratio of Astros to Rangers fans? I don't hear near as many Rangers fans at MMP. I've been to several regular season games in Arlington and there are always Astros fans everywhere. I am surprised that in the playoff games, however, that it seems so loud every time the Astros do something good. I figure more Rangers fans would have scooped up the tickets at their home games. Very cool actually.