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# ### Cohort output General structure: per variable one data file <sitename>_<var>.out<anz_sim> Detailed information about yearly and daily output can be found in the respective chapters. The following tables give an overview on the names of the variables which are listed in daily or yearly resolution and their description Daily output of cohort variables
<var> | content | 4C variable name | unit
ass | Optimum gross assimilation rate | assi | kg DW/d
aevi | Daily evaporation of intercepted water | aev_i | mm/day
ddi | Daily drought index | drindd | -
dem | Demand for soil water | demand | mm/day
dips | Drought index for Photosynthesis calulation | drindps | cum
gp | Unstressed stomatal conductance | gp | mol/m²*d
gsdps | Number of growingseason days per time step of photosynthesis | ndaysps | -
intcap | Interception (precipitation absorbed by the cohort per m² patch area) | sum of intcap(layer) | mm/day
interc | Interception storage (total intercepted precipitation by the cohort per m² patch area) | interc_st | mm/day
Ndemc_d | Daily N demand per tree |  | g
Nuptc_d | Daily N uptake per tree |  | g
N_pool | Daily N_pool per tree |  | g
RedNc | Daily photosynthesis nitrogen reduction factor |  | -
res | Leaf respiration rate | resp | kg DW/d
resbr | Daily respiration rate of br | respbr |
ressap | Daily respiration rate of sapwood | respsap |
resfrt | Daily respiration rate of frt | respfrt |
sup | Supply of soil water to roots | supply | mm/day
Yearly output of cohort variables
<var> | content | 4C variable name | unit
--- | --- | --- | ---
age | Tree-age per cohort | age | years
atr | Number of alive trees per cohort | ntreea | /td>
bioi | Net biomass increment | bio_inc | kg DM/year/tree
cpa | crown projection area | crown_area*ntreea | m²
daybb | Day of bud burst | day_bb | DOY
dcrb | Diameter of stem at crown base | dcrb | cm
diac | Drought index for Allocation calculation | drindal/ndaysgr | cum
diam | Diameter at breast height | diam | cm
dtr | Number of dead trees per cohort | ntreed | -
dwd | Stem biomass of dead trees per cohort | ntreed*(x_sap+x_hrt) | kg DM
fol | Foliage biomass | x_fol | kg DM/tree
foli | Foliage increment | fol_inc | kg DM/year/tree
frt | Fine root biomass | x_frt | kg DM/tree
frti | Net fine root increment | frt_inc | kg DM/year/tree
frtrel | Relative fine root fraction per soil layer | frtrel(1) | -
geff | Growth efficiency | geff | kg/m²
gfol | Gross growth rate foliage | gfol | kg DM/year/tree
gfrt | Gross growth rate fineroot | gfrt | kg DM/year/tree
grossass | Gross assimilation rate | grossass | kg DM/year/tree
gsap | Gross growth rate sapwood | gsap | kg DM/year/tree
gsd | Number of growing season days per year | ndaysgr | days
hbo | Bole height | x_hbole | cm
hea | Number of years without stress | x_health | years
hei | Total tree height | height | cm
hrt | Heartwood biomass | x_hrt | kg DM/tree
leaf | Leaf area per tree | t_leaf | m²
maintres | Maintenance respiration | maintres | kg DM/year/tree
nas | Realized net assimilation rate | netass | kg DM/year/tree
Ndemc_c | N demand per tree and year | Ndemc_c | g/year
npp | NPP | npp | kg DM/year/tree
Nstr | Ratio of N uptake to demand per tree and year | Nuptc_c /Ndemc_c | -
Nuptc_c | N uptake per tree and year | Nuptc_c | g/year
rooteff | Root uptake efficiency factor | rooteff(1) | -
sap | Sapwood biomass | x_sap | kg DM/tree
sfol | Senescence rate foliage | sfol | kg DM/year/tree
sfrt | Senescence rate fineroot | sfrt | kg DM/year/tree
spn | Species number of the cohort | species | -
ssap | Senescence rate sapwood | ssap | kg DM/year/tree
stem | Stemwood biomass increment | stem_inc | kg DM/year/tree
str | Number of stress years | x_stress | years
tdb | Total dead biomass per cohort | dbio | kg DM/year/tree
trman | Total number of harvested trees per cohort | ntreem | -
ttb | Total tree biomass | totbio | kg DM/tree
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