wavelengths = data.iloc[:, 0] # Extract wavelengths reflectance_data = data.iloc[:, 1] # Extract reflectance data # Calculate relative absorption strength # For simplicity, let's assume we want to compare the absorption strength at two specific wavelengths # You can adjust these wavelengths according to your specific analysis wavelength1 = 500 # Example wavelength 1 (in nm) wavelength2 = 700 # Example wavelength 2 (in nm) # Find indices corresponding to the closest wavelengths in the dataset idx_wavelength1 = np.abs(wavelengths - wavelength1).argmin() idx_wavelength2 = np.abs(wavelengths - wavelength2).argmin() # Calculate relative absorption strength absorption_strength = reflectance_data.iloc[:, idx_wavelength1] - reflectance_data.iloc[:, idx_wavelength2] I am getting an error in the last part of the code can you help me correct it?

# Calculate relative absorption strength
# For simplicity, let's assume we want to compare the absorption strength of
# a single line at a single wavelength, and that the line is a Gaussian.
#
# The line strength is given by the integral of the line profile over the
# wavelength range of interest.
#
# The line profile is given by the product of the line's intrinsic profile