▁and ▁high ▁wind s ▁created ▁by ▁the ▁fun n elling ▁effect ▁of ▁the ▁valley ▁below . ▁ ▁Top ography ▁ ▁See ▁also ▁ ▁List ▁of ▁mountains ▁of ▁New ▁South ▁Wales ▁ ▁References ▁ ▁G ung art an ▁G ung art an <0x0A> </s> ▁A ▁phase ▁portrait ▁is ▁a ▁geometric ▁representation ▁of ▁the ▁traject ories ▁of ▁a ▁dynam ical ▁system ▁in ▁the ▁phase ▁plane . ▁Each ▁set ▁of ▁initial ▁conditions ▁is ▁represented ▁by ▁a ▁different ▁curve , ▁or ▁point . ▁ ▁Ph ase ▁port ra its ▁are ▁an ▁in valu able ▁tool ▁in ▁studying ▁dynam ical ▁systems . ▁They ▁consist ▁of ▁a ▁plot ▁of ▁typical ▁traject ories ▁in ▁the ▁state ▁space . ▁This ▁reve als ▁information ▁such ▁as ▁whether ▁an ▁attract or , ▁a ▁rep ell or ▁or ▁limit ▁cycle ▁is ▁present ▁for ▁the ▁chosen ▁parameter ▁value . ▁The ▁concept ▁of ▁topological ▁equivalence ▁is ▁important ▁in ▁class ifying ▁the ▁behaviour ▁of ▁systems ▁by ▁specifying ▁when ▁two ▁different ▁phase ▁port ra its ▁represent ▁the ▁same ▁qual itative ▁dynamic ▁behavior . ▁An ▁attract or ▁is ▁a ▁stable ▁point ▁which ▁is ▁also ▁called ▁' s ink '. ▁The ▁rep ell or ▁is ▁considered ▁as ▁an ▁un stable ▁point , ▁which ▁is ▁also ▁known ▁as ▁' source '. ▁▁▁ ▁A ▁phase ▁portrait ▁graph ▁of ▁a ▁dynam ical ▁system ▁dep ict s ▁the ▁system ' s ▁traject ories ▁( with ▁ar rows ) ▁and ▁stable ▁steady ▁states ▁( with ▁d ots ) ▁and ▁un stable ▁steady ▁states ▁( with ▁circles ) ▁in ▁a ▁state ▁space . ▁The ▁axes ▁are