# Data product - C0003.1

**C0003.1 product shows the comparison between model's and observation's diurnal cycle.**

Each box plot displays, for a given species, daily-normalized molar fraction means according to the local time. One plot file per site / sampling height couple.

**Details:**

__Data used__:__ICOS observations__: hourly means, continuous time series.__ECMWF model__: data of the n^{th}nearest grid point, interpolated by date and time and by AGL, for the model experiment version(s) named in the legend.

__Points__: For each hourly mean, the daily mean is subtracted. Each point is the mean of these "normalized to daily mean" values, over the whole timeframe, at the given local time hour.__X-axis__: Local time hour.__Y-axis__: "Normalized to daily mean" molar fraction, in species' unit.__Colored ribbon__: 95% confidence interval for the mean.__Timeframe__: as described in header's subtitle (generally one rolling year).__Species__: CO_{2}and CH_{4}. One "box plot" per species

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