Why the pdf of ch7 is so large?

[Yu-Xiaoxian]

the pdf file of other chapters are only 400kB, but for ch7 is more than 40MB, this make my Adobe Reader very slow. Is there any problem?

[pptacher]

Hi I noticed that: it is due the drawings figure 3,4 : I used tikz to do that and unfortunately I did not manage to create lightweight drawings with the same rendering. I agree this is much too heavy a size for a simple pdf but it seems that is how tikz works.

[Yu-Xiaoxian]

I see. Another problem confusing me is that I cannot print this pdf file. When I try to print it with Adobe Reader, I encounter with an ERROR.

[pptacher]

ok I yet have to test this. I will have a look. Probably caused by the figure as well.