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Title: SN 2018agk: A prototypical Type Ia Supernova with a smooth power-law 
    rise in Kepler K2
Authors: Wang Q., Rest A., Zenati Y., Ridden-Harper R., Dimitriadis G.,
    Narayan G., Villar V.A., Magee M.R., Foley R.J., Shaya E.J., Garnavich P.,
    Wang L., Hu L., Bodi A., Armstrong P., Auchettl K., Barclay T., 
    Barentsen G., Bognar Z., Brimacombe J., Bulger J., Burke J., Challis P.,
    Chambers K., Coulter D.A., Csornyei G., Cseh B., Deckers M., Dotson J.L.,
    Galbany L., Gonzalez-Gaitan S., Gromadzki M., Gully-Santiago M., Hanyecz O.,
    Hedges C., Hiramatsu D., Hosseinzadeh G., Howell D.A., Howell S.B.,
    Huber M.E., Jha S.W., Jones D.O., Jones .O., Konyves-Toth R., Kalup C.,
    Kilpatrick C.D., Kriskovics L., Li W., Lowe T.B., Margheim S., McCully C.,
    Mitra A., Munoz J.A., Nicholl M., Nordin J., Pal A., Pan Y.-C., Piro A.L.,
    Rest S., Rino-Silvestre J., Rojas-Bravo C., Sarneczky K., Siebert M.R.,
    Smartt S.J., Smith K., Sodor A., Stritzinger M.D., Szabo R., Szakats R.,
    Tucker B.E., Vinko J., Wang X., Wheeler J.C., Young D.R., Zenteno A.,
    Zhang K., Zsidi G.
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Description of contents: This tar.gz archive file contains the data behind 
    Figure 3 of the accepted version of the manuscript listed above. These
    data include 18 spectra shown in the figure and listed here individually:
    
    2018agk-combined-20180711-api.mrt          Keck-I spectra taken on phase 103d
    SN2018agk-20180316-081426-het-v1.mrt       HET spectrum on 20180316 on phase -10.6d
    SN2018agk-20180317-gemini.mrt              Gemini spectrum on 20180317 on phase -9.5d
    SN2018agk-20180319-tns-lco.mrt             LCO dupont spectrum on 20180319  on phase -7.7d
    SN2018agk-20180323-074056-het-v1.mrt       HET spectrum on 20180323 on phase -4.1d
    SN2018agk-20180323-efosc.mrt               NTT spectrum on 20180323 on phase -2.8d
    SN2018agk-20180405-efosc.mrt               NTT spectrum on 20180405 on phase 9.8d
    SN2018agk-20180406-redblu-122345.184.mrt   FTS spectrum on 20180406 on phase 10.3d
    SN2018agk-20180407-efosc.mrt               NTT spectrum on 20180407 on phase 11.8d
    SN2018agk-20180409-redblu-131850.107.mrt   FTS spectrum on 20180409 on phase 13d
    SN2018agk-20180417-redblu-081455.117.mrt   FTN spectrum on 20180417 on phase 20.6d
    SN2018agk-20180420-efosc.mrt               NTT spectrum on 20180420 on phase 24.4d
    SN2018agk-20180425-kast.mrt                Shane spectrum on 20180425 on phase 28.4d
    SN2018agk-20180426-redblu-110751.729.mrt   FTN spectrum on 20180426 on phase 29.5
    SN2018agk-20180510-lris.mrt                Keck-I/LRIS spectrum on 20180510 on phase 43.1d
    SN2018agk-20180510-redblu-054839.728.mrt   FTN spectrum on 20180510 on phase 42.9d
    SN2018agk-20180618-goodman.mrt             SOAR spectrum  on  20180618 on phase 80.8d
    sn18agk_hst_mar24.mrt                      HST optical and UV spectrum on 2018 March 24 on phase -2.3d

    All files contain wavelengths in Angstroms and Flux in various units.
    Errors for Flux values are provided in some files. 

System requirements: The files are formatted according to the machine
    readable format used by the AAS Journals and CDS/VizieR. Specific
    information on the structure of MRT files can be found at:

        AAS: https://journals.aas.org/mrt-overview/
        CDS: http://cds.u-strasbg.fr/doc/catstd.htx

    These files can be read in python using the astropy package:

        from astropy.table import Table
        data = Table.read("sn18agk_hst_mar24.mrt", format="ascii.cds")

    or with the most recent version of TOPCAT (> Version 4.8)

Additional comments: The optical spectra are from various telescopes and
    reduced through different pipelines (see Section 2.3 and 2.4 for
    details), so the overall scale of spectral flux in individual spectrum
    could be off within an order of magnitude. Nonetheless, in the analysis
    only the normalized spectra have been used, and thus the deviation in
    the overall scale does not influence our results.

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