OptionVotes
YES
NO
238
42
1226
927
320
247
OptionProbability
The cesium 133 F=3 <-> F=4 hyperfine microwave transition (no change)
Any system based on weighted averages of uncertainty or timekeeping contributions
The strontium 87 1S0 <-> 3P0 optical transition
The ytterbium 171 1S0 <-> 3P0 optical transition
Any other optical transition in ions
Any other optical transition in neutral atoms
The thorium 229 metastable nuclear optical transition (any realization)
39
22
12
8
5
2
210
26
183
45
185
79
194
135
104
96
90
55
69
36
106
94