HTFS

用HTFS计算垂直热虹吸式再沸器时，出现这样的警告，请问可在哪里调整输入解决问题？谢谢！
*** WARNING *** You did not specify pressure dependence for the properties of  
the thermosyphon stream (stream 2). This may lead to inconsistencies, or      
inaccurate results. Switch pressure dependence on, or if possible, supply      
properties data at a second pressure level.