This layer is used to display a shape defined by a 
                    Function
                    Function that maps a number (percentage, time, etc.) to a value
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                    .
                          This shape can be colorized with a color gradient.
                          In the image above, the 
                    Function
                    Function that maps a number (percentage, time, etc.) to a value
                    Read More
                     used is a linear function.