Many equations give the way of calculating plasma parameters. Some of them includes (w); electron impact width parameter which authors refer to tables from Griem 1997. I can't find my way through those tables. I have all the parameters needed for calculating different plasma parameters but I can't solve this equation for not having (w) value when calculating Stark broadening.

delta lambda(1/2) = 2w (Ne/10^16)

I have Ne value but w value ???

THANK YOU