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POP 40 0; 80 2; 120 4; 200 2; 300 2; 430 0; 600 -2; 770 -4; 1000 -4; 1400 -2; 1800 -1; 2400 0; 3400 1; 4400 2; 5700 3; 7200 4; 9000 3; 11000 2; 13000 1; 16000 0