@BeginModule
@Name      = EcaSu
@Title     = Summer days index per time period
@Section   = ECA indices
@Class     = ECA index
@Arguments = ifile ofile
@Operators = eca_su

@BeginDescription
Let @file{ifile} be a time series of daily maximum temperatures TX,
then counted is the number of days where TX > T. The number T is
an optional parameter with default T = 25° Celsius. Note that TX
must be given in units of kelvin.
The date information for a time step in @file{ofile} is the date of
the last contributing time step in @file{ifile}.
@EndDescription
@EndModule


@BeginOperator_eca_su
@Title     = Summer days index per time period
@Parameter = [T]
@EndOperator


@BeginParameter
@Item = T
FLOAT   Temperature threshold (° Celsius, default: T = 25° Celsius)
@EndParameter


@BeginExample
To get the number of summer days for a time series of daily
maximum temperatures, use:
@BeginVerbatim
   cdo eca_su txfile ofile
@EndVerbatim
@EndExample
