... AP = alpha*p All the magnetic measures in the group are of the same polarity which is that corresponding to the preceding spots in that hemisphere for that cycle. ... Statements will be added to the above classification if the group is also of the "D = delta-configuration": spots of opposite polarity within 2 1/2 degrees of one another and in the same penumbra. ... of spots. ... E A bipolar group with penumbra on spots of both polarities and with a length between 10 and 15 heliographic degrees. ...