# gnuplot startup file
#
set datafile missing '-'
set macros
set grid

t0 = `awk 2>/dev/null                                                   \
  'BEGIN { ts = systime() }                                             \
  FNR == 1 { col = 0 }                                                  \
  col && col < NF { if (ts > $col) ts = $col; nextfile }                \
  /^[^#]/ { for (i=1;i<=NF;i++) if ($i == "ts") { col=i; next } }       \
  END { print ts }' *.log || echo 0`

ts = "(column('ts')-t0)"