Next, tropical regions over which the precipitation anomalies are similar between the La Niņa and MJO phase 1 (El Niņo and MJO phase 5) composites are delineated, as are regions where the same composite pairs differ substantially. The model is run again separately with heating anomalies confined to each small region, for each of the four precipitation composites. It is found that the response in the model is nearly linear, such that a sum of the extratropical response to convection over each region is comparable to the response to convection over all regions. A guided analog method is developed to test the response to the same convective anomalies in the reanalysis, and it is found that the observed response is generally similar to the model response. These results suggest that the extratropical response to both ENSO and MJO convective heating anomalies can be understood as arising from the competing influences of Warm Pool and tropical central Pacific convection. For the MJO, the extratropical response arises primarily from the Warm Pool heating, whereas for ENSO, the extratropical response is determined mostly by tropical central Pacific convection.