Draw trend line in xy plot

Hi,

I want to draw a trend line in a xy plot. I have these variables:

x ... years
v ... y - data field(0..3) (for 4 lines)
trend ... trend=dtrend_msg(x,v,True,True)

Variable: x
Type: integer
Total Size: 164 bytes
            41 values
Number of Dimensions: 1
Dimensions and sizes: [41]
Coordinates:
Number Of Attributes: 1
  units : years

Variable: v
Type: float
Total Size: 656 bytes
            164 values
Number of Dimensions: 2
Dimensions and sizes: [4] x [41]
Coordinates:
Number
Of Attributes: 2
  units : temperature [~F34~0~F21~C]
  _FillValue : 9.96921e+36

Variable: trend
Type: float
Total Size: 656 bytes
            164 values
Number of Dimensions: 2
Dimensions and sizes: [4] x [41]
Coordinates:
Number Of Attributes: 3
  _FillValue : 9.96921e+36
  y_intercept : ( -21.39967, -19.16433, -16.27571, -24.15463 )
  slope : ( 0.02267744, 0.02084449, 0.01997482, 0.02466693 )

Now i want to plot these 4 trend lines into the map.
what do i have to do to plot these trend lines?

I attached the ncl-file and the nc file.

Cheers,
Ronny

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