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When the "Tops" picking type is selected, Step 7 shows the two options for picking formation tops: across and down. You can change the pick style with the buttons on the Guide, or by using the
 and
 buttons on the Pick Tops part of the Quick List.
Pick Across This is the standard pick mode in the Cross Section module. In this mode, a single formation top is picked across all wells shown.
Pick Down - In this mode, tops are picked in the order they're shown on the Pick Tops list. Practically, this means that tops can be picked successively down the same wellbore before moving to the next wellbore. It helps to have the tops in a stratigraphically successive order going down the wellbore. Use the
 buttons to move a selected top up or down in the Pick Tops list.
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