anchor.diff:  
   # Extreme values
   
  -## Retrieve extreme values for the last X days for Y country [/extreme?wmoCountryId={wmoCountryId}&periodInDays={periodInDays}]
  -
  -By default [/extreme] endpoint (without any URL parameters) finds extreme values for the last 7 days and for 91 wmoCountryId (the id of UK). It is also possible to define X period (trough periodInDays URL parameter) and/or Y country (trough wmoCountryId URL parameter).
  +## Retrieve extreme values [/extreme]
  +
  +By default [/extreme] endpoint finds extreme values for the last 7 days and for all UK's stations which are identified by wmoCountryId=91 in Geostation file (the id of UK). Extreme values recalculate every hour.
   
   ### Example
   
  -`https://point-observation.weather.mg/extreme?wmoCountryId=261&periodInDays=90`
  -
  -+ Request extreme temperature data for country with 261 wmo country id (France) for the las 90 days
  +`https://point-observation.weather.mg/extreme`
  +
  ++ Request extreme temperature data for UK for the last 7 days
   
       + Headers
   
  
positive.code: 			"saturationDeficitInHectoPascal" : 8.8,
  			"validFrom" : "2016-12-13T11:00:00Z",
  			"validPeriod" : "PT0S"
  		}, 
  		{
  			"dewPointTemperatureInCelsius" : 13.3,
  			"visibilityProbabilityLessThan200MeterInPercent" : 1,
  
negative.code: 			"saturationDeficitInHectoPascal" : 6.9,
  			"validFrom" : "2016-12-13T11:00:00Z",
  			"validPeriod" : "PT0S"
  		},
  		{
  			"dewPointTemperatureInCelsius" : 13.6,
  			"visibilityProbabilityLessThan200MeterInPercent" : 0,
  