Noise plots

Jupyter doc to plot nosie measurements. Noise data were all taken manually and recording in a paper lab notebook, then copied to Python by hand, because our signal analyzer is really old.

本Jupyter文档用于绘制噪声测量结果。所有噪声数据均为手动采集，并记录于纸质实验记录本中，随后因所用信号分析仪较为老旧，需手动将数据录入至Python代码内。