What are the data elements shown on the GE235 flight data recorder (FDR) plot?
From top to bottom:


  
  main gear : whether there is weight-on-wheel not [scale on the left, in blue: "air/gnd"] (thanks to DeltaLima for pointing this out)
  VHF1 : probably if there was communication of that radio channel (speculation on my side) [no scale]
  Master warning : if the MW signal for engine flame out was active or not [scale on the right, in green : "fault/-"]
  CLA : Conditioner Lever Angle [scale on the right, in green : "fuel SO/no FSO"]
  Beta : usually is used to indicate aircraft sideslip, in this case is referring to the propeller blades, 90 degrees signal feathering. [scale on the left, in green : "90//10"]
  Bleed valve : whether it was open or closed (as labeled on the right) [scale on the right, in green : "open/closed"]
  PLA : power lever angle, aka throttle lever position [scale on the left, in green : "80//30"]
  ITT : inter turbine temperature [scale on the right, in green : "700//100"]
  NP : propeller RPMs as % of max RPMs [scale on the left, in green : "100//0"]
  Fuel flow [scale on the right, in green: "2000//0"]
  Objective TQ: objective torque (*) [scale on the right, in green : "100//80"]
  TQ : torque [scale on the right, in green : "200//0"]
  NL : low pressure shaft RPMs [scale on the left, in green : "100//0"]
  NH : high pressure shaft RPMs [scale on the right, in green : "100//0"]
  Oil pressure [scale on the right, in green : "100//0"]
  Barometric corrected altitude [scale on the left, in cyan: "2000//0"]
  


*: from page 2 of that link: