Parameters | Import | Feature Identifier for Computing Counts

Feature Identifier for Computing Counts
If your SAM or BAM file contains identifier information and you want to calculate read counts for a specific feature, you can use this field to specify the unique variable identifying the feature.
Note: SAM files typically do not contain this information. In most circumstances, you should use the parameters on the Summary tab for calculating count data.
Note: Some SAM files do not have headers. If your SAM file does not have headers, you can still specify a feature variable by typing VARn (where n is the column number of the desired variable) in the text box.
To Specify a Feature Identifier Variable:
For example, if your SAM file has no headers, but you know that the desired feature is listed in column 5, type VAR5 in the text box, as shown below: