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Tretinoin/DM-β-CD co-evaporated complex imaged by atomic force microscopy on air tapping mode conditions. AFM images of flat round shape complexes with different sizes. a Height image (4 × 4 μm2). b Histogram of the relative frequencies of the different complex population widths. c, d Height and phase images (1 × 1 μm2), respectively, of the same sample area
