I don't know what relationship 'lipid equivalent' has to 'lipid'. But yes you read it correctly. μg is 1 millionth of a gram. So most measured concentrations were around a few tenths of a millionth by weight or volume. From the table, most concentrations seem to peak around 2 hours. Interesting exception is in the Eyes where it keeps growing to 48h. It seems oddly persistent in Lungs as well. Come to think of it, i'm not sure I want to know how they measured concentrations of LNP in someone's eye >_<