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how to make upper and lower envelope line
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i want to make envelope line cover upper point and lower point using this data
data = [12437
15873
5204
5401
2503
3957
1698
3147
9081
99
3838
3907
2362
2705
12853
17247
1086
12349
545
659
378
436
2885
2348
3173
2097
1619
1889
15076
18044
]
how can i make this?