The output will be a JSON-encoded array. Each array element contains the following JSON object:
The count represents the number of values
The no-spec represents the number of values without spec
The in-spec represents the number of values within spec bandwidth
The offspec-internal represents the number of values off-spec in the internal spec range
The offspec-external represents the number of values off-spec in the external spec range
The min represents the minimum value of the field
The max represents the maximum value of the field
The sum represents the sum of all the values of the field
The avg represents the average of all the values of the field
The stddev represents the standard deviation of all the values of the field