  There has been a great deal of attention to the low lying energy spectum in a
nucleus becuse of the abundance of experimetal data. Likewise ,perhaps to a
lesser extent but still significant the high end for a given configuratiion has
been examined. Here ,using single j shell calculations as a guide we examine
the middle part of the spectum resulting form single j shell
calculations.Seniority arguments are used to partially explain the midshell
behaviours even though in general seniority is not a good quantum number for
mixed systems of neutrons and protons.
