Although Gemini most likely has a lower clearance/smaller ride envelope than other coasters in the park, there is still a good amount of space between the passengers and the beams. Although I'm not exactly sure of the actual height, the clearance also seems lower due to the angle of descent. Years back, though, there was an additional beam at the bottom of the first drop which you could barely reach if you were tall and stretched out your arms enough.
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-Dave Kochman
Pittsburgh