avg_quality
===========

    A float value indicating the average quality of the raw sequence.
    
    .. note:: 

       This tag can be used to investigate why sequences have not been assigned to any sample by 
       :doc:`ngsfilter <../scripts/ngsfilter>`
    
    .. seealso:: 

       - :doc:`head_quality <./head_quality>`
       - :doc:`mid_quality <./mid_quality>`
       - :doc:`tail_quality <./tail_quality>`
    
    Attribute added by the programs:
        - :doc:`ngsfilter <../scripts/ngsfilter>`