Table 3.
Summary of Δα/α values from this work for the left, central, and right regions, in units of ppm.
| Region |
||||
|---|---|---|---|---|
| Result type | Left | Central | Right | Comb. |
| Fiducial fitting results | ||||
| Δα/α value | 2.17 | 1.57 | 1.14 | 1.31 |
| 1σ statistical error | 3.31 | 5.59 | 1.45 | 1.29 |
| Systematic errors | ||||
| Redispersion (4.2.1) | 0.62 | 0.10 | 0.24 | 0.21 |
| Profile modelling (4.2.2) | 1.19 | 2.26 | 0.23 | 0.28 |
| Convergence (4.2.3) | 0.18 | 0.72 | 0.31 | 0.25 |
| Combined | 1.35 | 2.37 | 0.45 | 0.43 |
| Systematic error checks | ||||
| LFC vs. ThFP calibration (4.3.1) | < 0.02 | |||
| Combined LFC+ThFP calibration (4.3.2) | < 0.01 | |||
| Arm shifts (4.3.3) | < 0.14 | |||
| Trace shifts (4.3.4) | < 0.16 | |||
| Isotopic abundance variations (4.3.6) | < 0.7 | |||
Notes. The 1σ statistical and systematic error contributions are described in Sects. 4.1 and 4.2, respectively. The combined value of Δα/α is the weighted mean from the three regions, with 1σ statistical and systematic error values, as described in Sect. 4.4: Δα/α = 1.31 ± 1.29stat ± 0.43sys ppm. We note that all quantities are quoted with extra significant figures only to allow reproducibility. The checks on additional systematic errors in Sect. 4.3 were conducted in the right region only, with no evidence found that they contribute to the systematic error budget. Section numbers are provided in parentheses for the systematic error checks.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.