# What do the parameters k1 and k4 adopted in crack control tables in EC2 refer to?

Referring to page 123 of the code in EC2, BS EN 1992-1-1:2004, note 1 above Table 7.3N indicates that maximum bar spacing for crack control is derived based on $k_1$ parameter being 0.8 and $k_4$ parameter being 1.0. According to crack width calculation in clause 7.3.4(3), $k_1$ is 0.8 and $k_4$ is 0.425. Under stress limitation clause 7.2, $k_1$ is 0.6 and $k_4$ is 1.0. So, what do $k_1$ and $k_4$ refer to in Table 7.3N?

I need to know precisely what the parameters mean because I want to verify my crack width calculation based on clause 7.3.4 to see if they match with what is presented on the table.