Heed, Hid, Head, Had, Hod, Hawed, Hood, Who'd

Although the reading was kinda tough at points, I was able to understand the vowel exercise.  I recorded myself a few times because I found myself pronouncing way too much when I thought about the words too much.  

Here's what my spectrogram looked like, starting with "heed" and ending with "who'd":

I was surprised to see that they followed the trends pretty well.  Especially on the trends of the F1 formants.  The F2s for "hod" and "hawed" were a little closer to the F1s than I thought they would be.

I was a little confused with how exactly to graph it in the blank graph, so I'll get that done in class today (I wasn't sure if the horizontal axis should be the F2-F1 or just the F2).