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Rotation curve parameters for galaxies from the RFGC catalog
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This table contains the values of the free parameters of three rotation curve
functions (Arctan, Polyex, MPM) fitted to the rotation curves of galaxies from
the Revised Flat Galaxy Catalog (RFGC, Karachentsev et al. 1999).  For each
galaxy the best‑fitting parameters are given along with their formal
uncertainties.  A value of "--" in any numeric field indicates that the
parameter was not determined (missing data).

Byte‑by‑byte Description
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 col      Name        Format    Units      Description
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   1      Name          A8       ---       Galaxy name in RFGC catalog (e.g., RFGC0006)
   2      RA            A12      ---       Right ascension (J2000), "hh mm ss.s"
   3      Dec           A12      ---       Declination (J2000), "dd mm ss.s"
   4      r_c           I4       arcsec    Coordinates of the dynamical center at the slit
   5      V_c           F7.1     km/s      Velocity of the dynamical center
   6      err_V_c       F5.1     km/s      rms uncertainty in V_c
   7      r_at          F5.1     arcsec    Arctan scale
   8      err_r_at      F5.1     arcsec    rms uncertainty in r_at
   9      V_at          F5.1     km/s      Arctan amplitude
  10      err_V_at      F5.1     km/s      rms uncertainty in V_at
  11      r_pe          F5.1     arcsec    Polyex scale
  12      err_r_pe      F5.1     arcsec    rms uncertainty in r_pe
  13      V_pe          F5.1     km/s      Polyex amplitude
  14      err_V_pe      F5.1     km/s      rms uncertainty in V_pe
  15      alpha         F6.3     ---       Slope of the outer part (Polyex model)
  16      err_alpha     F6.3     ---       rms uncertainty in alpha
  17      r_mp          F5.1     arcsec    MPM scale
  18      err_r_mp      F5.1     arcsec    rms uncertainty in r_mp
  19      V_mp          F5.1     km/s      MPM amplitude
  20      err_V_mp      F5.1     km/s      rms uncertainty in V_mp
  21      gamma         F5.1     ---       Inner velocity variation parameter (MPM)
  22      err_gamma     F5.1     ---       rms uncertainty in gamma
  23      betta         F5.1     ---       Outer velocity variation parameter (MPM)
  24      err_betta     F5.1     ---       rms uncertainty in betta
  25      V_max         F5.1     km/s      Rotation velocity from the last observed point
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Notes:
  – The three rotation curve models are:
       Arctan:   V(r) = (2/π) · V_at · arctan(r / r_at)
       Polyex:   V(r) = V_pe · [1 − exp(−r / r_pe)] · (1 + α · r / r_pe)
       MPM:      V(r) = V_mp · (r / r_mp) / [1 + (r / r_mp)^γ]^(1/γ)   (or similar)
  – Parameters 21–24 (gamma, err_gamma, betta, err_betta) describe the shape
    of the MPM curve: gamma regulates the inner rise, betta regulates the
    outer decline (both dimensionless).

References:
  Karachentsev I.D., et al., 1999, A&AS, 135, 221 (RFGC catalog)
  (Original paper describing the rotation curve fits – please cite accordingly)

Acknowledgements:
  The data were kindly provided by the authors of the original study.

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