Copy multiple excel cells using AutoIt

I'm trying to copy a group of cells and paste them into Notepad using Autoit, but I can only copy if it's just a cell. If I put more than 1 it copies as 0.

So it correctly reads 1 cell:

Local $aResult = _Excel_RangeRead($oWorkbook, default, "L4", 3)

So it returns 0:

Local $aResult = _Excel_RangeRead($oWorkbook, default, "L4:O4", 3)