Weather Observation Station 19

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    select round(sqrt((abs((select min(lat_n) from station) - (select max(lat_n) from station))(abs((select min(lat_n) from station) - (select max(lat_n) from station))))+ (abs((select min(long_w) from station) - (select max(long_w) from station))(abs((select min(long_w) from station) - (select max(long_w) from station))))),4) from station limit 1;