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10.00010,000 100100 1.0001,000 1010 11 0,10.1 0,010.01 0,0010.001 0,00010.0001 19401940 19501950 19601960 19701970 19801980 19901990 20002000 20102010 1010 -9-9 1010 -10-10 1010 -11-11 1010 -12-12 1010 -13-13 1010 -14-14 1010 -15-15 1010 -16-16 1010 -17-17 1010 -18-18 Incertesa rell. (ns/dia)Clock Uncertainty (ns/day) AnyYear Freq. d'incertesaFrequency Uncertainty Rellotgesrefrigeratsper làserLaser - CooledClocks NBS-1NBS-1 NBS-2NBS-2 NBS-3NBS-3 NBS-4NBS-4 NBS-5NBS-5 NBS-6NBS-6 NBS-7NIST-7 NIST-F1NIST-F1