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entering extended mode
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Phase-portraits-for-a-system-of-linear-first-order-differential-equations.png: 
Graphic file (type QTm)

<use  "Phase-portraits-for-a-system-of-linear-first-order-differential-equation
s.png" >
300px-Phase_plane_nodes.svg.png: Graphic file (type QTm)
 <use  "300px-Phase_plane_nodes.svg.png" >
Underfull \vbox (badness 10000) has occurred while \output is active
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 [1]
Phase_plane_nodes1.PNG: Graphic file (type QTm)

<use  "Phase_plane_nodes1.PNG" > [2] )
Output written on ch9a.pdf (2 pages).