Electroabsorption modulator EAM

Hello.
I’m using OptiSytem7 and I’m designing a optical channel. In my optical source, I used a CW laser and an electro-absorption modulator measured. In this EAM properties, I noticed that there is a “Absorption/Alpha” parameter which takes a .dat file as input.
So, my question is to know what exactly values, I have to put in .dat file for this parameter ? Is it a decimal value got by doing (absorption divide by alpha) or is it either absorption value or alpha value ?
I wonder if the sign “/” means “divide by” or “either … or”

Thanks