System temperature on blank sky at C-band centered at 5000 MHz (Scans 20, 21, and 23). (Postscript Version) The spectral processor was used in 2x1024 mode with a bandwidth of 40 MHz. The three curves compare different spectral processor attenuator setting corresponding to power levels of approximately -5 (red), -12 (green), and -15 (blue) dBm. The larger the amplitude ripple the lower the power. The procedure TRACK was used towards blank sky.