def inspectCh(ds, chs):
t = TTree()
t.SetFillColor(0)
t.SetFillStyle(0)
for d in ds:
t.ReadFile(d[1])
cv1 = TCanvas()
cv1.Divide(2,4)
icv = 1
for ch in chs:
cv1.cd(icv)
t.Draw('A','ch=={0:d}'.format(ch))
hx = gPad.GetPrimitive('htemp')
hx.GetXaxis().SetTitle('U_{Out} [V]')
hx.SetName('h{0:d}'.format(ch))
lt.DrawLatexNDC(0.7,0.9,"Ch {0:d}".format(ch))
icv += 1
cv1.cd(0)
waitRootCmdX()
