Fig. 4From: Tiny Rare-Earth Fluoride Nanoparticles Activate Tumour Cell Growth via Electrical Polar InteractionsSurface parameter histograms (z-height) of PrF3 and LaF3 RE-NPs on a glass substrate in DMEM+FBS and ethanol for different scanning areas. a, e Area roughness. b, f Area RMS. c, g Average height. d, h Maximum z-rangeBack to article page