Data-Model.md

@@ -116,8 +116,8 @@ The cluster is a set of cell grouped on the basis track that produced them. It h
 | double | z | Z position of the cluster. It is the averaged Z position of the cell belonging to the cluster, weighted by the energy collected by the cell |
 | double | t | Time associated to the cluster. It is the averaged time of the cell belonging to the cluster, weighted by the energy collected by the cell |
 | double | e | Sum of the energy collected by the cells |
-| double | sx | Direction of the cluster. For each layer an energy weighted average X position is calculated and then the X positions are fitted |
-| double | sy | Direction of the cluster. For each layer an energy weighted average Y position is calculated and then the Y positions are fitted |
+| double | sx | Direction of the cluster. For each layer an energy weighted average X position is calculated and then the X positions are fitted with a linear track model |
+| double | sy | Direction of the cluster. For each layer an energy weighted average Y position is calculated and then the Y positions are fitted with a linear track model |
 | double | varx | Variance in X of the cluster |
 | double | vary | Variance in Y of the cluster |
 | double | varz | Variance in Z of the cluster |