Use for modeling  By checking the checkbox in the Marker Table, the marker is incorporated in the various modeling processes where markers are used as input, such as building of the structural model, well matching, or adding a marker-based surface to the 3D grid. An unchecked box indicates that the marker will not be used in those modeling processes and will be ignored. If the checkbox is disabled (grayed-out) for a particular marker or group of markers, this indicates that the In model data toggle (context menu option on the well/wellbore in the JewelExplorer) of the corresponding well is toggled off, and all markers of the well are excluded. Toggle In model data on to enable the checkboxes in the Marker Table.