Question about bistable multivibrator op amps

1. The problem statement, all variables and given/known data
So for one of my labs, I had to make a bistable multivibrator and observe the transfer characteristics. The circuit is setup as follows:
http://ift.tt/NhwvrA

(Image is too big to be inserted in this forum)

This resulted in the following hysteresis loop:
http://ift.tt/1ofkmyy

I noticed that in the graph, when the output flips from negative to positive (so looking at the vertical lines either on the left or right side), the voltage does not go straight up, instead it is slightly slanted. Does anyone know what could cause it to be slightly slanted?

Do note, that those vertical lines have been bolded by me on Paint.

2. Relevant equations
Vin_saturation = R1/R2 * L+

http://ift.tt/NhwvHQ

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