[cc65] sizof zp registers

Hi,
where can i find the size for each of this registers:

     .importzp       sp, sreg, regsave
     .importzp       ptr1, ptr2, ptr3, ptr4
     .importzp       tmp1, tmp2, tmp3, tmp4
     .importzp       regbank

The total size is 26 bytes, but where can i find the size for each of 
these registers.
I tried to fgrep and went through a lot of cfg files, without result yet)

Kind regards
marcas
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