Question: arrow field for 7 equations

Hi there,

I have a system of seven equations and want to make a phase plane with field arrows for two independent variables (C vs I). When I use DEplot it doesn't give me field with arrows. I just wonder if anybody could please help me in this issue. Here is my system:

dp/dt = P kappa I-gamma[1] CE- delta[1] CH

dE/dt = lambda E(E[0]-E)-gamma[1] C E

dI/dt = gamma[1] CE + eta Ia/(epsilon+K) -kappa I -alpha K I-delta[2] I M

dIa/dt = alpha K I+delta[2] I M

dH/dt = gamma[2] CH -mu[1]H

dM/dt = gamma[3] IM -mu[2]M

dK/dt = beta I M-chi K.

Where P=200, kappa=0.4,gamma[1]=0.03;delta[1]=0.2;lamda=1,E[0]=50,eta=0.05;epsilon=1,alpha=0.1,delta[2]=0.6;gamma[2]=0.4,gamma[3]=0.3,mu[1]=mu[2]=0.01, beta=0.1 and chi=0.001.

Any help will be appreciated.

Thanks.

Masoum

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