Help, problem with radiation pattern plot in HFSS 10.1

The radiation pattern for a simple dipole antenna in HFSS 10.1 ( WinXP) won't create continuous line. It consists of some discrete points. The plot is attached. I tried to change the settings in HFSS but could not figure it out by myself. I appreciate your help!

The problem have been solved. I have to set up the primary variable correctly in order to plot a continuous line rather than discrete points in radation pattern.

Added after 10 minutes:

The radiation pattern was attached in order to make my question and answer clear.