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TTVs are derived from Q1-Q15 Kepler data.  x-axes: “Observed Tc” (Mid-Transit Time): EXOFAST’s best-fits from Normalized PDCSAP_FLUX Kepler light flux vs. time (BJD_tdb - 2454900) data.  y-axes: “(O-C)”: difference between Observed Tc and the Calculated Tc from the graphically obtained linear ephemeris.

Figure: KOI-3423.01, P = 30.25 days [Plot avg. error bars = ± 8.49 min.]
TTV_minimum: 183.84 ± 56.84 days, Amp_ttv_minimum: -8.97 ± 3.80 min.
TTV_maximum: 450.73 ± 62.80 days, Amp_ttv_maximum: 11.49 ± 3.80 min.
TTV_minimum: 717.62 ± 72.51 days, Amp_ttv_minimum: -8.97 ± 3.80 min.
TTV_maximum: 984.50 ± 84.68 days, Amp_ttv_maximum: 11.49 ± 3.80 min.
TTV_minimum: 1251.39 ± 98.41 days, Amp_ttv_minimum: -8.97 ± 3.80 min.
P_ttv: 533.78 ± 34.64 days.
Amp_ttv: 20.46 ± 5.37 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 533.33 days; Power: 4.31; FAP: 0.101.
Linear ephemeris (this work): Tc = [30.25394703 ± 0.00016033](Tc#) + [69.64506274 ± 0.00407716]


References:
• Numerous literature and major Tc#, Tc, and TTV tabulation references can be found on my "Summary" webpage following the table.

16 Feb 2015
             Kepler KOI-3423.01 (KIC-3745559) 2-(or more?)-Planet System