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ppo=[0:10:100];
fetal74=[0 3.5 10.5 15.2 17.4 18.6 19.2...
   19.5 19.7 19.8 19.9];
plot(ppo,fetal74); hold on
fetal72=[0 2.2 7.3 12.0 15.2 16.9 18.0...
   18.6 19.1 19.5 19.9];
plot(ppo,fetal72)
maternal74=[0 1.3 4.6 8.7 11.5 13.2...
   14.2 14.7 15.0 15.0 15.1];
plot(ppo,maternal74)
maternal72=[0 1.0 4.0 7.8 10.6 12.5...
   13.7 14.4 14.7 14.9 15.1];
plot(ppo,maternal72)