Now a ONE second zero padding addition to the same. Note the sinc convultion in spectrum. This is clearly not due to change in freq-domain granularity increasing from 1/190 sec to 1/191 sec.
Now the 191 sec window w/ a one second zero pad:
Here's the same as above, w/ noise added. Note the persistence of the sinc convolution.
Finally, let's add a bunch more padding and zoom in around one of the fundamentals.