def remove_dataset_id(df, ds1_trend_column, ds2_trend_column):
	"""deletes the data set id from a given ptcf

	:param df: PTCF data frame
	:ds1_trend_column: column name ds 1 
	:ds2_trend_column: column name ds 2

	:return: ds without data set information  
	"""

	df[ds1_trend_column] = df[ds1_trend_column].str.split('_').str[1]
	df[ds2_trend_column] = df[ds2_trend_column].str.split('_').str[1]

	return df