text: """
  Include methods to manipulate echo data that is already converted to netCDF.
  Currently the operations include:
  
  - calibration
  - noise removal
  - calculating mean volume backscattering strength (MVBS)
  
  The current version supports EK60 `.raw` data.
  """
  
  from .ek60 import EchoDataEK60
  from .azfp import EchoDataAZFP
  