Figure 3.10: Left: the RMA background-correction transformation: the original PM intensities are plotted along the x-axis (on a logarithmic scale), the RMA background-corrected and log_2-transformed values along the y-axis. Without background-correction, the curve would be a straight line. The higher slope of the curve in the low-intensity range reflects the background subtraction. Middle: similar to left panel, but with VSN background-corrected and glog_2-transformed values along the y-axis. Right: Comparison of RMA background-corrected and log_2-transformed values with the VSN background-corrected and glog_2-transformed values.