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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 7 of the accepted version of the manuscript listed above. The archive
    contains two data files, corresponding to the HST STIS UV spectra taken at
    -7.3d and -2.3d before the B-band maximum brightness. The two files are
    as follows: 
    
    sn18agk_hst_mar19.mrt  HST UV spectra taken on phase -7.3d (2018 March 19)
    sn18agk_hst_mar24.mrt  HST optical and UV spectrum on 2018 March 24 on phase -2.3d

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_mar19.mrt", format="ascii.cds")

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

Additional comments: Notice that the two spectra are in different units. 
    The spectral flux density in sn18agk_hst_mar19.mrt is in standard unit 
    erg/s/cm2/A, while in sn18agk_hst_mar24.mrt the unit is 1e-16erg/s/cm2/A.

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