Formula:
When 0
°
<
∠
a < 15
°
, then 0 < a < 10
When 15
°
<
∠
a < 30
°，
10 < a < 20
；
When 30
°
<
∠
a < 45
°，
20 < a < 30
；
When 45
°
<
∠
a < 60
°，
30 < a < 40
；
Return to pre-scan mode to check the red line and the image’s position. If it is still incorrect, please re-
adjust until it is correct (as Figure C-2 shows).
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