obv 1 P of IMP points directly to a border tooth
I of IMP points to the left of a border tooth
The colon before IMP nearly points to a border tooth
The dot after IMP is small
The letter P is thinner
OBV2
The vertical stroke of P is slightly right of a border tooth
The I of IMP points to the right of a border tooth
The colon before IMP points to a space
The dot after IMP is larger
THe letter P is thicker