def lookup_values_from_error_table(scores, err_df):
    """ Find matching q-value for each score in 'scores' """
    ix = find_nearest_matches(np.float32(err_df.cutoff.values), np.float32(scores))
    return err_df.pvalue.iloc[ix].values, err_df.svalue.iloc[ix].values, err_df.pep.iloc[ix].values, err_df.qvalue.iloc[ix].values
Find matching q-value for each score in 'scores'