Polar charts?
When describing how well a speaker projects or a microphone receives sound at different angles of incidence, a polar chart is a swell way to show the data. Its easy to catch anomalies when looking at the polar chart. Much more so than looking at a list of numbers.
Please see google images for examples, here.
Methods for producing polar charts include:
• copying a blank chart into google images and drawing in your measurements
• Printing a blank chart and hand drawing the measurements, then scanning the drawing.
• Preferred: enter the data into a spread sheet and print a polar chart from that data.