Synthetic data used in ExampleData only has backscatter for one beam ("ADCP_Echo_Intensity.txt"), for user data, one should have backscatter for two beams with following names: "ADCP_Echo_Intensity_Beam_1.txt" and "ADCP_Echo_Intensity_Beam_2.txt"
Package arguments require variable names and units to match the names and variable units provided (see ?ExampleData, or .txt files in extdata folder)
Suggest saving all csv files in .txt format to ensure time format is not changed when editing/saving csv in Excel