Calculation Aqueous Lithium Bromide Vapour Pressure in Absorbtion Chiller

LiBr Vp chart:

http://www.mediafire.com/view/x77zc8wj11gthsj/LiBr_Vp.jpg

or

http://www.mediafire.com/view/u4dnocvbsf3atmu/Useful_Chart_LiBr.pdf

Lecture in question (p.13)

http://www.mediafire.com/view/gly78yz339hv1x1/RAC_Lecture_15.pdf

In the lecture it says that at this temperature & at this concentration crystallisation will occur... however how can this be ascertained using the chart? I do know how to read such Duhring plots..

My second query directly relates to the LiBr Vp chart itself... at y-axis saturated water properties (Temp/Pressure) are plotted (refrigerant in Absorption cycle is water)

These can be easily matched with the following table

http://www.mediafire.com/view/8vh7lx9s7e9cc7e/saturated_water_table.pdf

This means that what I am looking at saturated water properties of water.. how come I takes these readings as vapour pressure reading of LiBr.H2O system? The latter vapour pressures will eventually be less than pure water vapour pressures