sen1_def1 = DEF(rrdfile=sen1_file, vname='Sen1data', dsName='Sensor1', cdef='LAST')
sen1_cdef = CDEF(vname='Temp1DegC', rpn='%s,32,-,5,*,9,/' % sen1_def1.vname)
sen1_line = LINE(defObj=sen1_cdef, color='#00FF00', legend='Sensor 1')

sen1_aver = VDEF(vname='Sens1aver', rpn='%s,AVERAGE' % sen1_cdef.vname)
sen1aver_line = LINE(defObj=sen1_aver, color='#0000FF', legend='Sensor 1 Average')