1. A computer system comprising: a processor; a memory device coupled to the processor; a pointing device coupled to the processor; a display device coupled to the processor, the display device showing a cursor whose position is based on position data generated by the pointing device; the memory device stores a program that, when executed by the processor, causes the processor to: perform a simulation using an earth model of a hydrocarbon bearing formation over a plurality of modeled times; store output data from the simulation for each of the plurality of modeled times in association with a state of the earth model at that modeled time; display the output data relative to the plurality of modeled times in a first pane on the display device; monitor the position of the cursor on the display device relative to the displayed output data in the first pane; when the monitored position of the cursor overlays a particular datum in the displayed output data for a particular modeled time, identify the state of the earth model at the particular modeled time associated with the particular datum in the stored output data; and display, in a second pane on the display device distinct from the first pane, the identified state of the earth model at the particular modeled time associated with the particular datum.