diff --git a/bilby/gw/conversion.py b/bilby/gw/conversion.py
index 498c54248109b298cd82e3ad6e21dc3957470485..148a88bffc3ef20b56db02d80d089a7c91e4ef27 100644
--- a/bilby/gw/conversion.py
+++ b/bilby/gw/conversion.py
@@ -1,6 +1,5 @@
from __future__ import division
import numpy as np
-import pandas as pd
from ..core.utils import logger, solar_mass
from ..core.prior import DeltaFunction
@@ -511,8 +510,8 @@ def lambda_1_lambda_2_to_delta_lambda(lambda_1, lambda_2, mass_1, mass_2):
lambda_plus = lambda_1 + lambda_2
lambda_minus = lambda_1 - lambda_2
delta_lambda = 1 / 2 * (
- (1 - 4 * eta) ** 0.5 * (1 - 13272 / 1319 * eta + 8944 / 1319 * eta**2)
- * lambda_plus + (1 - 15910 / 1319 * eta + 32850 / 1319 * eta**2 +
+ (1 - 4 * eta) ** 0.5 * (1 - 13272 / 1319 * eta + 8944 / 1319 * eta**2) *
+ lambda_plus + (1 - 15910 / 1319 * eta + 32850 / 1319 * eta**2 +
3380 / 1319 * eta**3) * lambda_minus)
return delta_lambda
@@ -736,7 +735,7 @@ def generate_spin_parameters(sample):
Parameters
----------
- sample : dict, pd.DataFrame
+ sample : dict, pandas.DataFrame
The input dictionary with some spin parameters
Returns
@@ -829,12 +828,12 @@ def generate_tidal_parameters(sample):
Parameters
----------
- sample: dict, pd.DataFrame
+ sample: dict, pandas.DataFrame
Should contain lambda_1, lambda_2
Returns
-------
- output_sample: dict, pd.DataFrame
+ output_sample: dict, pandas.DataFrame
Updated sample
"""
output_sample = sample.copy()
@@ -857,11 +856,11 @@ def generate_source_frame_parameters(sample):
Parameters
----------
- sample: dict, pd.DataFrame
+ sample: dict, pandas.DataFrame
Returns
-------
- output_sample: dict, pd.DataFrame
+ output_sample: dict, pandas.DataFrame
"""
output_sample = sample.copy()