Fig. 3
Measurement accuracy of the QCMs of the Cloud 6 and 12 system. The reference signal (QCMref) is obtained from fluorimetric analysis of the deposited fluorescein salt. Panel a depicts the entire investigated mass range (ca. 100–15,000 ng/cm2) and panel b zooms in on the lower end of it highlighting the high degree of linearity of the QCMs over the entire dose range. (n = 6; Error bars represent 95% confidence level (2 SEM); note: error bars smaller than the symbol of the data point are not visible)