Not able to find qwtplot3D

["Ashivni Shekhawat" <shekhawat.ashivni@gmail.com>]

Hi!
   I am new to Debian. I have trying to install qwtplot3d on my
machine; however I get the following error:

# apt-get install qwtplot3d
Reading package lists... Done
Building dependency tree... Done
E: Couldn't find package qwtplot3d

The package qwtplot3d is available on ftp.debian.org at
http://ftp.debian.org/debian/pool/main/q/qwtplot3d/

my sources.list reads

cat /etc/apt/sources.list
#
deb cdrom:[Debian GNU/Linux 4.0 r0 _Etch_ - Official i386 CD Binary-1
20070407-11:55]/ etch contrib main
deb http://ftp.debian.org/debian/ etch main
deb http://ftp.us.debian.org/debian/ etch main
deb http://security.debian.org/ etch/updates main contrib
deb http://http.us.debian.org/debian/ etch main



Why is apt-get not able to find the package?

Thanks in advance
--Ashivni.