Minor correction
Minor correction

self._tb corrected to self._tp

landlab/landlab,laijingtao/landlab,cmshobe/landlab,SiccarPoint/landlab,csherwood-usgs/landlab,cmshobe/landlab,RondaStrauch/landlab,ManuSchmi88/landlab,landlab/landlab,RondaStrauch/landlab,amandersillinois/landlab,laijingtao/landlab,ManuSchmi88/landlab,Carralex/landlab,Carralex/landlab,cmshobe/landlab,decvalts/landlab,ManuSchmi88/landlab,decvalts/landlab,Carralex/landlab,RondaStrauch/landlab,SiccarPoint/landlab,amandersillinois/landlab,landlab/landlab,csherwood-usgs/landlab