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select round(sqrt(power(max(LAT_N)-min(LAT_N),2)+pow(max(LONG_W)-min(LONG_W),2)),4) from station; /* d≈ (Δx)^ 2+(Δy)^ 2
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Weather Observation Station 19
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select round(sqrt(power(max(LAT_N)-min(LAT_N),2)+pow(max(LONG_W)-min(LONG_W),2)),4) from station; /* d≈ (Δx)^ 2+(Δy)^ 2