Fig. 2From: Photoacoustic and high-frequency ultrasound imaging of systemic sclerosis patientsa Oxygen saturation (%), b skin thickness (mm) between the nailfold and the distal interphalangeal joint of the third finger, and c capillary density (capillaries per millimeter). SSc, systemic sclerosis; early SSc, early systemic sclerosis; PRP, primary Raynaud’s phenomenon; HV, healthy volunteer. Box plot between 25th and 75th percentile, line at medianBack to article page