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XRPD diffractograms of indomethacin–arginine (IND–ARG), IND–histidine (IND–HIS) and IND–lysine (IND–LYS) mixtures prepared by spray-drying (SD). Organic solvent denoted in percentage (%) is acetone (AC) in (a,c,e); and ethanol (EtOH) in (b,d,f).
