Just Found this table
Vowel F1(Hz) F2(Hz) F3(Hz)
heed 280 2620 3380
hid 360 2220 2960
head 600 2060 2840
had 800 1760 2500
hudd 760 1320 2500
hard 740 1180 2640
hod 560 920 2560
hoard 480 760 2620
hood 380 940 2300
who'd 320 920 2200
heard 560 1480 2520
Dont know if this will help
got it from
http://www.phon.ucl.ac.uk/courses/sp...n/handout3.pdf