A cavern type arch with 3 openings formed by 2 pillars.
This image shows the #1 and #2 openings. The spans of the
openings are 20'6", 21'6", and 60'. The heights are
1'6", 3'6", and 6'6". The pillar dimensions are: between
#1 and #2 25' x 5' and between #2 and #3 36' x 9'.

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