Hi! There are typos in the first formula of two tutorials: [QuTiP Lecture: Pulse-wise two-photon interference of emission from a two-level system](https://nbviewer.ipython.org/github/qutip/qutip-notebooks/blob/master/examples/pulse-wise-two-photon-interference.ipynb#QuTiP-Lecture:-Pulse-wise-two-photon-interference-of-emission-from-a-two-level-system) [QuTiP Lecture: Pulse-wise second-order optical coherences of emission from a two-level system](https://nbviewer.ipython.org/github/qutip/qutip-notebooks/blob/master/examples/pulse-wise-second-order-coherence-g2.ipynb) The exponents of two interaction terms should be swapped. Currently they are:  It is supposed to be: 
Hi!
There are typos in the first formula of two tutorials:
QuTiP Lecture: Pulse-wise two-photon interference of emission from a two-level system
QuTiP Lecture: Pulse-wise second-order optical coherences of emission from a two-level system
The exponents of two interaction terms should be swapped.
Currently they are:
It is supposed to be:
