citydata =  [ 0.0238  7.8051;  0.3578 15.2853;  0.6497  3.6793;  1.3204 10.9011;  1.4492 15.8550; ...  
              2.0213  0.3218;  2.2543 19.1925;  2.8215 15.3896;  3.0000 17.8929;  3.5690  4.2403; ...
              3.8204 12.2826;  4.1616  0.5375;  4.8260  9.2293;  5.1478 12.6491;  5.5220  7.5354; ...
              5.9040  3.6493;  6.2892  1.0209;  6.6253 14.4553;  7.1349 19.0674;  7.4547 13.8568; ... 
              7.9050  0.2963;  8.2478  0.8365;  8.7173 10.2039;  9.0048 16.6783;  9.5055 12.7361; ... 
              9.8438 13.9615; 10.1626  4.8221; 10.6109 14.1361; 10.9179  9.0515; 11.2858 13.5688; ...
             11.8905  1.2753; 12.2487  7.0816; 12.7027  3.3004; 13.0640 16.1567; 13.2974 14.2259; ...
             13.6013 12.0236; 14.1434 14.0270; 14.3925 14.9380; 14.8333 14.0580; 15.3482  3.1621; ...
             15.5632 15.5738; 16.2227 12.6353; 16.4221 19.8233; 16.8625 16.1981; 17.1462 11.8972; ...
             17.5464  6.3140; 18.0863  0.9932; 18.3222  2.8772; 18.9006 17.4563; 19.1583  2.1408;];