You should use the vector of the slot as tolerance zone for the TP. Depending on how the leader lines are connecting to the slot, they also depict the tolerance zone for you to use (at least thats the way it's done in ISO-land). Often these leader lines are connected either parallell or perpendicular to the slot, meaning that the direction of the slot tells you the direction of the tolerance zone. Extra important when there is a TP in one axis (non-Ø tolerance zone).
You should use the vector of the slot as tolerance zone for the TP. Depending on how the leader lines are connecting to the slot, they also depict the tolerance zone for you to use (at least thats the way it's done in ISO-land). Often these leader lines are connected either parallell or perpendicular to the slot, meaning that the direction of the slot tells you the direction of the tolerance zone. Extra important when there is a TP in one axis (non-Ø tolerance zone).