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Quick tutorial
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Select pictures
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<-- Fig.1
A picture can be selected by touching it. As shown in Fig.1, you have selected 4 pictures whose borders become red or blue. The red border means that there will be lines coming from the corresponding pictures and pointing to the blue-border pictures.
Fig.2 -->
Fig.2 shows what happens after the selecting.
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Select curves and arrows
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<-- Fig.3
Touching curves, if they become red and dashed, it means that you've selected it, as it is shown in Fig.3.
Fig.4 -->
After selecting the curves, click the 'Edit' button on the top right to change the arrow type of the selected curves. See Fig.4
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<-- Fig.5
Please pay attention to the arrows of the red dashed curves. They have changed from triangle-like arrows into spear-like arrows. See Fig.5
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Delete curves and arrows
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<-- Fig.6
Select a curve. Then press the 'Delete' button the top left. The selected curve and arrow will be deleted.
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