In addition , the drum modes analogous to p and d modes in an atom show spatial irregularity along the different radial directions from the center of the drum , .
All of the modes analogous to s modes are perfectly symmetrical in radial direction .
In addition , the drum modes analogous to p and d modes in an atom show spatial irregularity along the different radial directions from the center of the drum , whereas all of the modes analogous to s modes are perfectly symmetrical in radial direction .