Fig. 4From: Quality control material for the detection of somatic mutations in fixed clinical specimens by next-generation sequencingNormal quantile plots. The Shapiro-Wilk test was performed to assess the normality of the distribution of each of the adjustable parameters: coverage (a), ≥Q20 Bases (b), TVC Quality (c), and TVC Quality (Log10) (d). The expected quantile line for a normal distribution is shown in redBack to article page