501    690173.029  252809.205  456.566   690173.055  252809.216  456.560  
502    690173.035  252809.183  459.750   690173.001  252809.256  459.730  
503    690172.025  252808.004  459.654   690172.056  252808.035  459.650
504    690171.654  252810.658  460.000   690171.600  252810.597  460.003