The array is in a format that can be directly used in BaseChart.gradientColor2 and DrawArea.gradientColor2. Its contents (in hex) is:
00 E09898 60 FFF0F0 B0 F0D8D8 100 E09898
See Color Specification on how colors are represented in ChartDirector.
ChartDirector 5.1 (PHP Edition)
phpchartdir.redMetalGradient
Description