This function returns the norm_info element of the isobaric_info attribute which indicates if the data have been isobaric normalized.
get_isobaric_norm(omicsData)an object of the class 'pepData', 'isobaricpepData' or
'proData', usually created by as.pepData,
as.isobaricpepData.
A logical value indicating whether the data have been isobaric normalized.