Hello Gianluca, is it possible that the second yellow line that Nicolas is referring to (‘DBB’) is an indicator called “Price comparison / Confronto valore” that you set on an instrument which ticker is ‘DBB’ and added it to the chart?
If so what you are getting on your charts is a spread between SPDR Gold Shares and iShares Silver Trust represented by the blue line, and on top of that you have a yellow curve representing DBB’s price (Invesco DC Base Metal Funds maybe?) which isn’t compared to anything, simply added on top of the GLD/SLV spread). If you want to compare DBB to another instrument/spread you have to create a new spread for it.
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