What is the difference in ratio to median remuneration between the two Executive Directors?
{"Non-executive directors -- N Chandrasekaran@": {"Ratio to median remuneration": "-", "% increase in remuneration in the financial year": "-"}, "Non-executive directors -- Aman Mehta": {"Ratio to median remuneration": 51.55, "% increase in remuneration in the financial year": 5.0}, "Non-executive directors -- V Thyagarajan*": {"Ratio to median remuneration": "^", "% increase in remuneration in the financial year": "^"}, "Non-executive directors -- Prof Clayton M Christensen**": {"Ratio to median remuneration": "^", "% increase in remuneration in the financial year": "^"}, "Non-executive directors -- Dr Ron Sommer": {"Ratio to median remuneration": 36.0, "% increase in remuneration in the financial year": 4.76}, "Non-executive directors -- O P Bhatt": {"Ratio to median remuneration": 35.18, "% increase in remuneration in the financial year": 7.5}, "Non-executive directors -- Aarthi Subramanian@@": {"Ratio to median remuneration": "-", "% increase in remuneration in the financial year": "-"}, "Non-executive directors -- Dr Pradeep Kumar Khosla": {"Ratio to median remuneration": 24.55, "% increase in remuneration in the financial year": "^^"}, "Non-executive directors -- Hanne Sorensen***": {"Ratio to median remuneration": "^", "% increase in remuneration in the financial year": "^"}, "Non-executive directors -- Keki Mistry***": {"Ratio to median remuneration": "^", "% increase in remuneration in the financial year": "^"}, "Non-executive directors -- Don Callahan****": {"Ratio to median remuneration": "^", "% increase in remuneration in the financial year": "^"}, "Executive directors -- Rajesh Gopinathan": {"Ratio to median remuneration": 262.3, "% increase in remuneration in the financial year": 28.31}, "Executive directors -- N Ganapathy Subramaniam": {"Ratio to median remuneration": 190.01, "% increase in remuneration in the financial year": 24.88}, "Chief Financial Officer -- Ramakrishnan V": {"Ratio to median remuneration": "-", "% increase in remuneration in the financial year": 22.58}, "Company Secretary -- Rajendra Moholkar": {"Ratio to median remuneration": "-", "% increase in remuneration in the financial year": 18.23}}
rajesh_ratio = df["Executive directors -- Rajesh Gopinathan"]["Ratio to median remuneration"]
n_ratio = df["Executive directors -- N Ganapathy Subramaniam"]["Ratio to median remuneration"]
answer = rajesh_ratio - n_ratio