Add example 6

Author: neuromechanist

emg_examples/sub-s6MutliBodyParts/emg/sub-s6MutliBodyParts_task-mechPerturbations_channels.json

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+{
+    "Coordsystem": {
+        "hand-coordsystem":{ 
+            "EMGCoordinateUnits": "percent",
+            "EMGCoordinateSystemDescription": "X: RSP → USP; Y: Dorsal → Palmar surface at the midpoint RSP-USP; Z: MCP → midpoint RSP-USP; Ulnar Styloid Process (USP), Radial Styloid Process (RSP); Ulnar Styloid Process (USP);Third Metacarpophalangeal Joint (MCP): The knuckle of the middle finger"
+        },
+        "lower-leg-coordsystem":{ 
+            "EMGCoordinateUnits": "percent",
+            "EMGCoordinateSystemDescription": "X: FME → FLE; Y: Popliteal Fossa → Patellar Anterior Surface; Z: midpoint FME-FLE → Greater Trochanter; Femur Medial Epicondyle (FME); Femur Lateral Epicondyle (FLE); Patellar Anterior Surface; Back of the knee (Popliteal Fossa)"
+        }
+    }
+}

emg_examples/sub-s6MutliBodyParts/emg/sub-s6MutliBodyParts_task-mechPerturbations_channels.tsv

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+name	type	units	target_muscle	interelectrode_distance	placement	loc_reference
+EMG1	emg	V	First Dorsal Interosseous	20 mm	[0,0,40]	hand-coordsystem
+EMG2	emg	V	Tibilias Anterior	20 mm	[60,100,50]	lower-leg-coordsystem 

emg_examples/sub-s6MutliBodyParts/emg/sub-s6MutliBodyParts_task-mechPerturbations_emg.json

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+{
+	"EMGChannelCount":2,
+	"EMGPlacementScheme":"The sEMG sensor was located on the belly of the muscle at a position distant from the innervation zones and the muscle tendon interface, following the recommendations of De Luca, 1997 and Saitou et al., 2000. For the sake of this example we will try to included the exact location of the electrodes in the channels.tsv file.",
+	"EMGReference":"bipolar",
+	"EMGGround":"n/a",
+    "EMGElectrodeCount":4,
+    "ElectrodeMaterial":"Ag/AgCl",
+	"Manufacturer":"Delsys",
+	"ManufacturersModelName":"Trigno DE via Delsys Bagnoly-8 amplifier",
+    "AmpifierType":"Wired",
+	"RecordingDuration":1.00,
+	"SamplingFrequency":2000,
+    "HardwareFilters":"loawpass at 450 Hz, Highpass at 0.15 Hz",
+	"TaskDescription":"The movement artifacts were analyzed during limb perturbations on with EMG snesors attached to both lower and upper limbs",
+	"TaskName":"mechPerturbations",
+	"TriggerChannelCount":0
+}