Description:

Indicator input parameters:

• Symbol1 and Symbol2 - symbols for calculation of prices difference and displaying it as a chart. AUDUSD and NZDUSD by default.
• mass_of_symbol1 and mass_of_symbol2 - quantitative ratio of trading symbols. Both parameters are equal to 1 by default. If you want to calculate the sum of symbols, put -1 to mass_of_symbol2 parameter. Sum calculation is used to evaluate the possibility of applying negative correlation symbols in pairs trading.

 Image:

 The image displays:

 AUDUSD chart above, NZDUSD chart in the middle and Spread Of Symbols indicator below.