Convert selection option to Internal table

I have declared s_field as selection -option.

I need to convert s_field to internal table.

For Example.

If I passed the values to s_field as 1 to 5(low =1 high =5)

Then internal table should contains 1 2 3 4 5

Can anyone please suggest how I can change the selection-option to internal table in abap 7.40?