Power is displayed as a bar colored by your personal training zones. The default scale of the power graph field is FTP + 10% to optimize the graph.
|POWER ZONE COLORS|
FTP is shown on the graph as a dotted line. If the power output exceeds FTP+10% the graph will adjust scale to match the max value in the current span.
When that value is no longer displayed, as graphing data is replaced in a fixed span, the graph will readjust its scale to return to either the max power value or to FTP+10%.