Relative permittivity from text file

Dear all,

I would like to use the relative permittivity fit for silver provided by the FDTD Solutions software by Lumerical. I exported this fit as two ASCII text files consisting of two columns separated by spaces. The first file contains the wavelength vs. real part of the relative permittivity, whereas the second file contains wavelength vs. imaginary part of the relative permittivity. My aim is to use the data as it is without any interpolation. There is only interpolation function which allows me to import this function and that is exactly why I posted this thread. How can I do so?

Thanks in advance

P.S: I am working with COMSOL 5.1 RF Module on Windows 7. I have also attached a relevant screenshot.