The script is based on the great work of @NgUTech which very nicely prints the gaps on any given chart.
The purpose of this script is to show the gaps to futures or cfd of the underlying cash chart, because very often gap closing provides an opportunity to fade the move.
The script works in the way that the user provides the underlying chart symbol and the current spread of the instruments (cash-future/cfd) and it draws boxes where the cash-gaps are.
If you know a way to automatically calculate the spread of the two instruments, please let me know, thanks. Michael