Every column is one day and every cell one hour, shaded by how much the array made in it. Nothing here draws the shape of the year: the seasons widen and narrow the bright band on their own.
The orange curves are sunrise, solar noon and sunset, calculated from the site's latitude and longitude and the date. They were never fitted to the data. That they trace the exact edge of the measured band is a check on both at once — the geometry and the meter agreeing, independently.
Pale vertical streaks are overcast days. The band steps by a full hour in March and again in November, which is the clock changing, not the sun. Of — days, the array reported in — hours, the best of them worth — kWh — — MWh in all.
nonepeak not recorded computed sun position