https://www.febo.com/pipermail/time-nuts/2017-April/104600.html Here is the plot on the Zeeman frequency data that we gathered this morning. It is close to Figure 4-43 (page 4-31) in the service manual for the HP5061B. Thanks to Jonathon for plotting this. http://gonascent.com/papers/hp/hp5061/waveform/zeeman.jpg πθ°μΩω±√·Γλ WB0KVV