def remove_low_std(X,std_val=0.01):
	"""
    Remove features below this standard deviation
    
    Parameters
    ----------
    X : pd.DataFrame
		analytes with their features (i.e. molecular descriptors)
	std_val : float
		float value to cut-off removing features

    Returns
    -------
    list
        list with features to remove
    """
	rem_f = []
	std_dist = X.std(axis=0)
	rem_f.extend(list(std_dist.index[std_dist<std_val]))
	return(rem_f)