Coated vs. Uncoated Copper Wires

[Grouch]

Table 8 in Chapter 9 includes columns for coated and uncoated copper wires, under DC resistance.
Table 9 in Chapter 9 only includes a column for uncoated copper wires, under AC resistance.

How come Table 9 doesn't include information for coated copper wires?

 

[Frank DuVal]

My SWAG is because it doesn't make enough difference to list it, thus making the table very wide. A printing decision.