G38.2 example

in the linuxcnc documentation this example of gcode is provided
G49
G38.2 Z-100 F100
#<zworkoffset> = [#[5203 + #5220 * 20] + #5213 * #5210]
G10 L1 P#5400 Z#<zworkoffset> (set new tool offset)
G43
i want to understand this equation #<zworkoffset> = [#[5203 + #5220 * 20] + #5213 * #5210].
any help is appreciated

#[5203 + #5220 * 20] This is the value of the z offset of the currently active work offset system
Note: the offset value registers of all the work offset systems [1..9] are 20 registers apart.


+ #5213 * #5210] This adds the z offset of 52/G92 if it is applied, if it is not applied the product is equal to zero

See numbered parameters:
linuxcnc.org/docs/html/gcode/overview.ht...:numbered-parameters