Internal structure of jagged array in .NET

Internal structure of jagged array in .NET

I created simple jagged array:
int[][] a = new int[2][];
for (int i = 0; i < 2; i++)
{
a[i] = new int[3];
for (int j = 0; j < 3; j++)
a[i][j] = i * 3 + j;
}
After that I started debugging my application and looked to this array
sturcture in memory:
0x03022478 0 // SyncBlockIndex (a)
0x0302247C 0x61B8D5BC // TypeHandle (a)
0x03022480 2 // a.Length
0x03022484 0x617A4C8A // ???
0x03022488 0x03022494 // a[0]
0x0302248C 0x030224AC // a[1]
0x03022490 0 // SyncBlockIndex (a[0])
0x03022494 0x61B9C448 // TypeHandle (a[0])
0x03022498 3 // a[0].Length
0x0302249C 0 // a[0][0]
0x030224A0 1 // a[0][1]
0x030224A4 2 // a[0][2]
0x030224A8 0 // SyncBlockIndex (a[1])
0x030224AC 0x61B9C448 // TypeHandle (a[1])
0x030224B0 3 // a[1].Length
0x030224B4 3 // a[1][0]
0x030224B8 4 // a[1][1]
0x030224BC 5 // a[1][2]
I understand almost all the data: SyncBlockIndexes, TypeHandles, Lengths,
Elements. But I can't understand only one line:
0x03022484 0x617A4C8A // ???
What it is?