Histogramme Volume limit sell buy

Hello
A small modification please,

Cluster profile graph:
horz hist left limit; sellers: color in red
horz hist right limit buyers: color in green

Limit numbers:
option 1; the trader chooses his limit figures.
option 2; figures calculated by the program and based on the statistic of the normal distribution of the market profile ? ......
option 3; synchronization of sell and buy limit volumes, they are identical automatically.

Thanks.