Noise spectra of typical LFA pixels in different readout chains. The data are from a 5-minute integration on a sky position. Gray traces show raw data; black traces show data after atmospheric noise removal. Both traces are smoothed with a 0.1 Hz Gaussian. The green line shows the best-fit to signal, indicating noise level above 2 Hz. The red line shows the estimated detector noise after median filtering of contaminant before data smoothing.