In this graph, the x-axis is labeled "SNR (dB);" it begins at 0 and runs in increments of ten to 40. The y-axis is labeled "BER;" it begins at 10-7 and goes upward at regular intervals to 10-6, 10-5, 10-4, 10-3, 10-2 and 10-1.

A black line labeled "BPSK (1 Mbps)" begins just above 10-2 on the y-axis and arches downward to about 9 on the x-axis. A blue line labeled "QAM16 (4 Mbps)" begins at 10-1 on the y-axis and 10 on the x-axis, and arches downward to about 19 on the x-axis. A dashed blue line labeled "QAM256 (8 Mbps)" begins at 10-1 on the y-axis and 20 on the x-axis, and arches downward to about 31 on the x-axis.