exponential fit {{2.1, 4.4}, {2.5, 4.5}, {2.8, 4.8}, {4.4, 5.5}, {4.5, 5.5}, {5.2, 6.8}, {6.4, 9.4}, {7.1, 10.5}, {8.2, 18.2}, {9.1, 28.3}, {10.2, 47.2}}

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