Astronomy & Astrophysics

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$\begin{figure} \par\includegraphics[width=18cm,clip]{aa0139-04f1.eps}\end{figure}$ Figure 1: Notations used in the paper ( left) and schematics of the turbulent slab model ( right). A lowercase boldface letter stands for a three-dimensional vector, while the corresponding uppercase represents its projection on the plane of the sky (xOy). The slab is infinite in the x and y directions and is limited to I_D=[-D/2,D/2] in the z direction. The density $\rho$ and line-of-sight velocity v distributions along a line of sight are shown on the right. The mean values $\rho _0$ and v₀ are taken over the whole slab.
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In the text

$\begin{figure} \par\includegraphics[width=18cm,clip]{aa0139-04f2.eps}\end{figure}$ Figure 2: Interpretation of the average $M_{\rho ,\rho }$ appearing in Eq. (23). The slab is viewed edge-on in the left figure, and face-on in the right. The value of $M_{\rho ,\rho }$ at any lag $\vec{R}$ is the average of the correlation function $B_{\rho ,\rho }$ over all pairs of points whose projected separation on the plane of the sky is $\vec{R}$ . Three such pairs are presented on the left.
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In the text