Axis naming for multiple parameters in one graph I have four angles and I like to show them in a angle–time graph using Matlab’s plot function. The problem is the naming of vertical y-axis. Should it be:


plural, i.e., Position Angles since the graph is showing four different angles, or
singular, i.e., Position Angle as shown below since the important point is the meaningful explanation of axes regardless of parameter count given in the graph?
You should use the singular, "Position Angle," because an axis is  interpreted as referring to each data element individually.

In order words, at time 0.4, the red line is not at approximately "60 angles," but is at an angle of approximately 60 degrees.