DXF codes precision

I would like to know if there's a way of extracting from the dxf definition data of a lwpolyline a value of the x and y coordinates of one of the lwpolylines' vertex with at least 8 decimals.

All I seem to get are 5 decimals with this:

taining Entity Information

;obtaining one of the vertex X coordinate

(setq ent (entlast))

(setq entl (entget ent))

(setq ptx (car(cdr (nth 18 entl))))

Presuming the 18th pair of the list (dxf definition of a lwpolyline) are the coordinates of a vertex.

If anyone knows how to obtain longer chains of decimals out of the coordinates of a vertex in a polyline through the DXF definition please help.

Thanks in advance.

(setq ptx (rtos (cdr (assoc 10 entl)) 2 15))

The precision is there, it's just not displayed

$ (cdr (assoc 10 (entget (car (entsel)))))

(-1.30764 -5.14976)

_$ (rtos (car (cdr (assoc 10 (entget (car (entsel)))))) 2 15)

"-1.307643600178494"

as in the title, thanks!!!!!!