Usually one school has only one coverage map. However, there are some exceptional cases. For example, Don Callejon Elementary school in Santa Clara Unified district has grade range from K to 8. That means that it serves as both Elementary and Middle schools. Interestingly, it has different coverages as Elementary school and Middle school. For such situation, we provide a "radio button" to allow user select different coverage for such a dual-role school, which is illustrated in the following graph.