Despite its seemingly simple look, the indicator has two very useful functions for professional scalpers:

• Display of the real Ask and Bid (the data shown after enabling the Ask in the options are not real).
• Drawing indicators with the minimum and maximum values per bar.

It is useful to obtain the best performance scalping or to detect spread irregularities in favor of a broker.

Checking out those graphs, you will make better decisions when choosing a strategy, or even choosing the best entry points.

Warning

Broker's history records do not save the Ask values.

The indicator will draw graph lines on each bar.

Obvously, changing period will erase the graph.

If I see that it has acceptance, I will include a save/restore from the indicator buffers to display the previously generated graphs.