Error: 'function' parameter not supplied, please see the following manual:

required parameters:
'function'
	o-> option of 'results', 'avg_daily', 'avg_monthly' and 'avg_annual'

'output'
	o-> option of 'text' or 'votable'
	
'delim'
	o-> delimiter for text output, option of 'tab', 'space', 'comma' or 'semicolon' (defaults to 'comma')
	
'startDate' and 'endDate'
	o-> date limits on results, in the format 'yyyymmdd' for example: '20090131'

optional parameters:
'sdevtol'
	o-> standard deviation tolerance specified as a maximum decimal value for example: '0.15'