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plot 4500*exp(-x^2/(2*200000)) + 2000*exp(-x^2/(2*20000000)) from x=0 to x=20000 and y=0 to y=7000
plot 4500*exp(-x^2/(2*200000)) + 2000*exp(-x^2/(2*20000000)) from x=0 to x=20000 and y=0 to y=7000
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