# Changes between Version 104 and Version 105 of DatabaseBasedAnalysis/Spectrum

Ignore:
Timestamp:
Dec 5, 2019, 10:39:01 AM (11 months ago)
Comment:

--

### Legend:

Unmodified
 v104 The differential flux $$\phi(E)$$ per area, time and energy interval is defined as [0] $\phi(E) = \frac{dN}{dA\cdot dt\cdot dE}$ [0] $\phi(E) = \frac{dN}{dA\cdot dt\cdot dE}$ Often $$\phi(E)$$ is also referred to as $$\frac{dN}{dE}$$ as observation time and effective collection area is a constant. The effective area is then defined as $$A_\textrm{eff}(E)=\epsilon(E)\cdot A_0$$. Note that at large distances $$R_0$$ the efficiency $$\epsilon(R_0)$$ vanishes, so that the effective area is an (energy dependent) constant while $$A_0=\pi R_0^2$$ and the efficiency $$\epsilon(E)$$ are mutually dependent.