Prominence (m) ใดมีอันดับ 10 และ Col (m) น้อยกว่า 50
Which Prominence (m) has a Rank of 10, and a Col (m) smaller than 50?
df = pd.DataFrame(columns=['prominence__m_', 'rank', 'col__m_'])
df.loc[(df['rank'] == 10) & (df['col__m_'] < 50), 'prominence__m_'].min()