[R] Bollinger Band quantmod

[bgnumis bgnum]

Hi all,

When I plot Bollinger bands  with

chartSeries(
IBEX,theme="white",
  TA = c(addBBands(50,2))

)

There is a "no" shadow area that it is used to obtain the levels. How can I
plot with charSeries so that the plot start on the shadow area? I mean,
¿How can I say to de axis start plotting f.i. 50 steps forward on the chart
Series?

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