Steelflame
Terrarian
For as wide as that is, I take it you want a ovular, not a circular, dome. I'd mark the max limit on the hight you want to go to, and make a diagonal line between that point and where you want the curve to stop. Start filling it out, remember, you will start with large, and reduce to small, lines. So a 5-4-3-3-2-2-1-1-1-2-3-4-5 or something for distances for the 1 down for every X over, then 1 over for every X down after the 1s. I'd actually have to do it in game to give you the exact numbers though, those that I listed were only a guess without me even checking how it would look based on the design you have.
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