There are a number of charts available from the online report. The charts are listed on the top right of the report detail view.
Clicking on a chart will pop up the results in a new window.
Uptime / Downtime Pie Chart
Response Time Chart
Response Time Distribution by day of the week or hour of the day
Hovering over different areas of the charts causes a tool tip box to pop up with relevant information about the line or area.
Clicking and dragging to select an area on the charts will zoom in on the selected area.