If we reduce the tolerance values to zero we will get many samples when rendering the scene and viewing it in Nuke (see below).
However, if we raise the tolerance values (see below), we are effectively creating a threshold by which the samples are merged.
Output layer names can be customized by adding an optional custom layer name after the driver name. Output layers in files that support layers (such as regular or deep EXR files) can be individually set to type 'HALF' by adding an optional 'HALF' modifier to the corresponding output string. For instance: "my_aov RGB filter driver HALF".