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PSD of AH in vaccines formulated with AP in 7.5 w/v% trehalose. Lines are as follows: liquid vaccine: black solid line, SFD vaccines: light gray; FD vaccines: dark gray. Line types are indicative of samples processed with different secondary drying temperatures: long dash: 10 °C, short dash: 30 °C, and dotted: 50 °C. The solid light and dark gray lines are for the samples processed with no secondary drying.
