Those graphs are just displayed to know about the visualize knowledge of Eye blink in RAW EEG signal. RAW EEG data Value consists of two bytes, and represents a single raw wave sample. Its value is a signed 16-bit integer that ranges from -32768 to 32767.
By default, Mindwave Mobile / Brainsense output of this Data Value is enabled, and is outputed 512 times a second, or approximately once every 2ms.
The graphs which are displayed in the above blink are captured using NeuroView (Research Tools).
The unsigned one byte eye blink value reports the intensity of the user's most recent eye blink. Its value ranges from 1 to 255 and it is reported whenever an eye blink is detected. The value indicates the relative intensity of the blink, and has no units.
If you want to get an EYE blink strength value, This data value is currently only available via the ThinkGear Communication Driver TGCD and TGC APIs. It is not directly available as output from any current ThiinkGear hardware/ThinkGear packets.