speaker word vowel F1 F2 Alexa heed i 384 2693 Alexa hid I 526 2364 Alexa hayed e 540 2555 Alexa head E 752 2075 Alexa had a 876 2094 Alexa hod A 1007 1464 Alexa HUD v 695 1587 Alexa hawed O 803 1223 Alexa hoed o 542 1199 Alexa whod u 387 1264