What it does

Creates a boxplot graph for the quality scores in the library.

TIP: Use the FASTQ Statistics tool to generate the report file needed for this tool.

Output Examples

• Black horizontal lines are medians
• Rectangular red boxes show the Inter-quartile Range (IQR) (top value is Q3, bottom value is Q1)
• Whiskers show outlier at max. 1.5*IQR

An excellent quality library (median quality is 40 for almost all 36 cycles):

A relatively good quality library (median quality degrades towards later cycles):

A low quality library (median drops quickly):

This tool is based on FASTX-toolkit by Assaf Gordon.