Experiment 1-A Experiment 1-B Figure 3. Accuracy in Experiment 1. The darker the area is, the higher the accuracy of the area is. Experiment 1-A Experiment 1-B Figure 4. Time in Experiment 1. The darker the area is, the shorter the time of the area is.
 
   Figure 5. Analyzed regions: 11 landscape regions (red; ID = 0;


; 10) and 32 portrait regions (blue; ID = 11;


; 42), which has almost the same footprint as the built-in QW- ERTY keyboard. To search for an optimum region to place a keyboard, we compared pointing performance among various re- gions where we can place a keyboard. To do this, we rst calculated the average accuracy and time within the regions shown in Figure 5. To evaluate each region by taking both accuracy