# RTA4 Q Score Bin Ranges on the MiSeq i100 Series **Background** The MiSeq i100 Series utilizes Real Time Analysis v4 (RTA4) for base calling and quality scoring. There are three Q score bins used on the MiSeq i100 Series, and these Q score calls are reported as an average for the range of called scores. Please see below for the relevant Q Score Bins and Ranges. MiSeq i100 Control Software version 1.1 and later | **Quality Score Bin** | **Quality Score Range** | | --------------------- | ----------------------- | | 2 | NoCall, 0-2 | | 9 | 3-17 | | 23 | 18-29 | | 38 | 30+ | MiSeq i100 Control Software version 1.0 | **Quality Score Bin** | **Quality Score Range** | | --------------------- | ----------------------- | | 2 | NoCall, 0-2 | | 12 | 3-17 | | 24 | 18-29 | | 38 | 30+ | \ \ \
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