diff --git a/articles/Wu_ICIP_2012/Wu_ICIP_2012.xopp.xml b/articles/Wu_ICIP_2012/Wu_ICIP_2012.xopp.xml
index 444e047..f5c4e66 100644
--- a/articles/Wu_ICIP_2012/Wu_ICIP_2012.xopp.xml
+++ b/articles/Wu_ICIP_2012/Wu_ICIP_2012.xopp.xml
@@ -27,6 +27,40 @@
78.63943481 212.82376099 103.41469363 212.82376099
154.10906982 212.40234375 294.61920570 212.40234375
79.34304810 223.27105713 254.63002133 223.27105713
+ ?
+ ?
+ what difference?
+ 149.96598433 238.37817786 298.98572873 238.37817786
+ 79.18447974 248.85495044 300.57127855 248.85495044
+ 135.63527495 253.22698776 265.79459455 253.22698776
+ 78.92264742 265.66958283 295.46183981 265.66958283
+ 79.49191889 275.50608541 259.06216884 275.50608541
+ 273.12608913 280.50406038 297.88717858 280.50406038
+ 78.03846915 290.58087093 299.10495474 290.58087093
+ 79.68861828 301.51781172 297.45567465 301.51781172
+ 79.52476959 310.66370884 225.09580677 310.66370884
+ 210.16574741 326.86403139 298.87181138 326.86403139
+ 80.41269460 335.88212602 294.71050200 335.88212602
+ 79.79821249 349.30596999 204.09710710 349.30596999
+ 214.33005185 348.82359697 259.68110708 348.82359697
+ 78.95517943 358.22072358 293.76261195 358.22072358
+ 81.45632021 368.04943984 184.52856458 368.04943984
+ P?
+ 191.02476168 373.30231351 296.47838894 373.30231351
+ 77.00101919 383.17564609 130.61445512 383.17564609
+ 233.47405220 310.65406207 297.31158671 310.65406207
+ 79.40290159 321.07138641 291.05373975 321.07138641
+ 78.31730391 330.05089396 198.38096432 330.05089396
+ 166.48270375 421.18029011 242.44324758 421.18029011
+ 77.43266053 480.32269816 154.67706010 480.32269816
+ 161.23591099 479.08360484 215.44498775 479.08360484
+ 217.78273464 432.20930589 295.88296627 432.20930589
+ 79.47170374 441.26064742 147.37423487 441.26064742
+ ?
+ 205.97897978 446.13586722 300.10361596 446.13586722
+ 79.46017068 456.42440717 148.73408020 456.42440717
+ 164.08656635 456.75022687 250.77415832 456.75022687
+ 77.87422426 463.49263093 253.40392920 463.49263093