The dashed step line is the basal profile: the hourly rates programmed in the pump. The filled steps are the basal actually delivered. Where the fill rises above the dashed line, the loop raised the rate with a temporary basal; where it drops below it or to zero, delivery was reduced or suspended.
Boluses (triangles, units) and carbs (circles, grams) sit on the same time axis as the readings, with a guide line down into the glucose lane. Glucose is green inside the 3.9–10 mmol/L target band, red above it and blue below it.