This block is filled for each SVTSIM track:   (data read from SVTD simulated bank)

  ******************************************************************
 * Var num * Type  *  Block   *  Name          *  Description
 ******************************************************************

 *      1  * I*4   * SVTSIM   * snsvt          N.of svtsim tracks

 *      3  * R*4   * SVTSIM   * schi2(snsvt)   *  Chi2
 *      2  * R*4   * SVTSIM   * sc(snsvt)      *  Curvature (cm-1)
 *      4  * R*4   * SVTSIM   * sd(snsvt)      *  Impact Parameter (cm)
 *      5  * R*4   * SVTSIM   * sf(snsvt)      *  Phi0 (rad)
 *      7  * R*4   * SVTSIM   * spt(snsvt)     *  Pt (GeV/c)
 *      8  * I*4   * SVTSIM   * srd(snsvt)     *  Road number
 *      9  * I*4   * SVTSIM   * swd(snsvt)     *  Wedge [0-11]
 *     10  * R*4   * SVTSIM   * sx0(snsvt)     *  track coord.(cm) on 1st Si layer
 *     11  * R*4   * SVTSIM   * sx1(snsvt)     *                   on 2nd Si layer
 *     12  * R*4   * SVTSIM   * sx2(snsvt)     *                   on 3rd Si layer
 *     13  * R*4   * SVTSIM   * sx3(snsvt)     *                   on 3rd Si layer
 *     18  * I*4   * SVTSIM   * szin(snsvt)    *  track IN barrel [0-5]
 *     19  * I*4   * SVTSIM   * szout(snsvt)   *  track OUT barrel [0-5]

 *      6  * I*4   * SVTSIM   * snxft(snsvt)   *  miniwdg of XFT linked trk [0-287]
 *     14  * R*4   * SVTSIM   * sxft_c(snsvt)  *  curvature of XFT linked trk
 *     15  * R*4   * SVTSIM   * sxft_f(snsvt)  *  phi0 of XFT linked track
 *     16  * R*4   * SVTSIM   * sxft_f6(snsvt)phi6 of XFT linked track
 *     17  * R*4   * SVTSIM   * sxft_pt(snsvt)pt of XFT linked track