X-axis values in xlLine chart problem

[Gary]

Hi,

I have the following code:
$Range = $Sheet->Range( "A3:A93" );
if ($Range)
{
$Chart->SeriesCollection( 1 )->{XValues} = $Range->{Value};
}

it doesn't set the X-axis values as I would expect.

my range contains values "-60" to "40".

it works fine if the range contain positive values .

any help would be greatly appreciated.

-Gary