Table 2
Tested evolution scenarios with corresponding χ2/degrees of freedom.
| Model Parameters | Raw flux | Recalibrated flux | ||
|---|---|---|---|---|
| Model Parameters | Fitted values | χ2/d.o.f. | Fitted values | χ2/d.o.f. |
| Constant Mean flux [×10−12 cm−2 s−1] | 1.70 ± 0.03 | 30.4/15 | 1.66 ± 0.05 | 14.9/15 |
| Linear Gradient [×10−14 cm−2s−1 yr−1] | −0.7 ± 0.9 | 28.6/14 | −0.7 ± 1.1 | 14.5/14 |
| Constant-by-era Mean fluxes [×10−12 cm−2 s−1] | 1.75 ± 0.05 1.63 ± 0.07 | 26.2/14 | 1.69 ± 0.06 1.63 ± 0.09 | 14.6/14 |
Notes. Each model is described in Section 4.2. All models are compatible with our data, but nonconstant hypotheses are not significantly preferred by our data (uncertainties on the gradient in the linear model and on both constants in the constant-by-era model make them compatible with a constant solution).
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.