diff --git a/Article/notions.tex b/Article/notions.tex
index f1a863f05f286769d1d48fa8612ef02fc8187340..9d976bebb7511f1c439cb7a5a669229b0d827c65 100755
--- a/Article/notions.tex
+++ b/Article/notions.tex
@@ -192,10 +192,13 @@ of the blurred segment computed at the former position $i$.
 The adaptive directional scan $ADS$ is then defined by :
 \begin{equation}
 %S_i = \mathcal{D}_{i-1} \cap \mathcal{N}_i
-ADS = \left\{ S_i = \mathcal{D}_i \cap \mathcal{N}_i \cap \mathcal{I} |
-\delta(\mathcal{N}_i) = - \delta^{-1}(\mathcal{D}_0)
-\cap h_0(\mathcal{N}_i) = h_0(\mathcal{N}_{i-1}) + p(\mathcal{D})
-\cap \mathcal{D}_{i+1} = d (\mathcal{B}_i,\varepsilon) \right\}
+ADS = \left\{
+S_i = \mathcal{D}_i \cap \mathcal{N}_i \cap \mathcal{I}
+\left| \begin{array}{l}
+\delta(\mathcal{N}_i) = - \delta^{-1}(\mathcal{D}_0) \\
+\cap h_0(\mathcal{N}_i) = h_0(\mathcal{N}_{i-1}) + p(\mathcal{D}) \\
+\cap \mathcal{D}_{i+1} = d (\mathcal{B}_i,\varepsilon)
+\end{array} \right. \right\}
 \end{equation}
 The last clause expresses the update of the scan bounds at step $i+1$.
 Compared to static directional scans, the scan strip moves while