Interfacing LVPECL to CML

Hi team,

I find an application note named "Interfacing Between LVPECL, LVDS and CML",http://www.ti.com/analog/docs/litabsmultiplefilelist.tsp?literatureNumber=scaa056&docCategoryId=1&familyId=346&keyMatch=SCAA056&tisearch=Search-EN-Everything

I find LVPECL to CML interface using AC coupling, the attentuation factor should be CML/LVPECL swing. so the example caluation that I shown below makes mistake to get 0.68 for CML400mV/LVPECL 750mV? Is that a typing mistake or my caluation mistake?

thanks for your clarification!