XY chart data adquisition

Hi,
I am adquiring data in real time, I process the data and I send the information to an xy graph, I want that every loop the next data does not erase the previous.
I attached two images where I show the xy graph, my idea is that every loop the new data will be plot in the same graph without delete the previous data.
Attachments:
Impedance 1.png ‏14 KB
Impedance 2.png ‏22 KB

It would be more interesting if you would show the diagram.
If you are using the "build xy graph" express VI, simply configure it to retain data between calls.
LabVIEW Champion . Do more with less code and in less time .

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Thank you,
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<resources>
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<resource id="5" name="Gross, Johannes-Ludwig" />
<resource id="8" name="Pecherski, Andrzej" />
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<period resource_id= "31" start="24-DEC-12 12.00.00.000000000 AM" end="31-DEC-12 12.00.00.000000000 AM" style="green" />
<period resource_id= "8" start="27-DEC-12 12.00.00.000000000 AM" end="28-DEC-12 12.00.00.000000000 AM" style="green" />
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<period resource_id= "8" start="21-DEC-12 12.00.00.000000000 AM" end="21-DEC-12 12.00.00.000000000 AM" style="blue" />
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<period resource_id= "33" start="09-APR-13 12.00.00.000000000 AM" end="09-APR-13 12.00.00.000000000 AM" style="red" />
<period resource_id= "33" start="01-MAY-13 12.00.00.000000000 AM" end="01-MAY-13 12.00.00.000000000 AM" style="red" />
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<period resource_id= "8" start="30-DEC-13 12.00.00.000000000 AM" end="30-DEC-13 12.00.00.000000000 AM" style="green" />
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<period resource_id= "8" start="21-MAY-13 12.00.00.000000000 AM" end="24-MAY-13 12.00.00.000000000 AM" style="green" />
<period resource_id= "8" start="27-MAY-13 12.00.00.000000000 AM" end="29-MAY-13 12.00.00.000000000 AM" style="green" />
<period resource_id= "8" start="31-MAY-13 12.00.00.000000000 AM" end="31-MAY-13 12.00.00.000000000 AM" style="green" />
<period resource_id= "8" start="02-APR-13 12.00.00.000000000 AM" end="05-APR-13 12.00.00.000000000 AM" style="green" />
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XY chart data adquisitio​n

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