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SELECT ROUND(SQRT(POWER(A-B,2) + POWER(C-D,2)),4) AS ED
FROM (
SELECT MIN(LAT_N) AS A,
MAX(LAT_N) AS B,
MIN(LONG_W) AS C,
MAX(LONG_W) AS D FROM STATION
) AS VAL
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Weather Observation Station 19
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SELECT ROUND(SQRT(POWER(A-B,2) + POWER(C-D,2)),4) AS ED FROM ( SELECT MIN(LAT_N) AS A, MAX(LAT_N) AS B, MIN(LONG_W) AS C, MAX(LONG_W) AS D FROM STATION ) AS VAL