Figure 2:
Top Panel: Same as the third top panel in Figure 1.

Middle Panel: A case considering only the changes in solar insolation.

Bottom Panel: Time series of natural factors given to the model.
The yellow line shows the changes in solar insolation and the blue line shows the effect of the aerosol reaching to the stratosphere due to a large-scale volcanic eruption, which cools off the surface. Note that these two are not for direct comparison since they shows different physical quantity.
The warming trend in the early 20th (1910 to 1945) century cannot be explained only by the increase in solar insolation. Both gradual temperature rise due to the increase in solar insolation and the recovery from the cooling due to the volcanic eruption cause the warming trend concurrently.