How to remove the number caused by 'grid on' and How to change the legend mark

I want to draw the pole-zero map of the specific system. This is my code:

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close all;
clear;
clc;
w0=300;
l1=2*w0;
l2=w0^2;
k=60;
s=tf('s');
r=[0.9,1.2,1.3,1.4,1.8,2.5,3.5];
H=figure;
for i=1:7
    transfer_function=k*(s^2+l1*s+l2)/(r(i)*s^3+r(i)*(l1+k)*s^2+(k*l1+l2)*s+k*l2);
    pzmap(transfer_function)
    hold on;
end
s=findobj(gcf,'Type','Axes');
title('');
set(s,'XLim',[-300,0],'YLim',[-60,60],'XColor',[0,0,0],'YColor',[0,0,0],'XGrid','off','YGrid','off','GridLineStyle','--','YTick',[-60 -40 -20 0 20 40 60]);
set(s.XLabel,'FontSize',12,'FontName','TimesNewRoman');
set(s.YLabel,'FontSize',12,'FontName','TimesNewRoman');
linewidth=1.5;
set(s.Children(1).Children(1),'LineWidth',linewidth,'Color','#ESAD00');

Error using matlab.graphics.primitive.Line/set
Error setting property 'Color' of class 'Line':
Invalid color name or hexadecimal color code. Valid names include: 'red', 'green', 'blue', 'cyan', 'magenta', 'yellow', 'black', 'white', and 'none'. Valid hexadecimal color codes consist of '#' followed by three or six hexadecimal digits.

set(s.Children(1).Children(2),'LineWidth',linewidth,'Color','#7C6FAF');
set(s.Children(2).Children(2),'LineWidth',linewidth,'Color','#AA7816');
set(s.Children(3).Children(2),'LineWidth',linewidth,'Color','#EE6C1B');
set(s.Children(4).Children(2),'LineWidth',linewidth,'Color','#E02F12');
set(s.Children(5).Children(2),'LineWidth',linewidth,'Color','#75AB43');
set(s.Children(6).Children(2),'LineWidth',linewidth,'Color','#238392');
set(s.Children(7).Children(2),'LineWidth',linewidth,'Color','#0728E4');
grid on;
legend('r=3.5','r=2.5','r=1.8','r=1.4','r=1.3','r=1.2','r=0.9');

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I tried to usd 'pzmap' and 'pzplot' to draw the graph, and once the 'grid on' and 'legend' are used. The grid and the number which is undired, look this picture. And the legend is linear which is not 'x'.

I want to draw a graph like this:

How should I do?

[Walter Roberson]

Fixing the 'ES' to 'E5'...

close all;
clear;
clc;
w0=300;
l1=2*w0;
l2=w0^2;
k=60;
s=tf('s');
r=[0.9,1.2,1.3,1.4,1.8,2.5,3.5];
H=figure;
for i=1:7
    transfer_function=k*(s^2+l1*s+l2)/(r(i)*s^3+r(i)*(l1+k)*s^2+(k*l1+l2)*s+k*l2);
    pzmap(transfer_function)
    hold on;
end
s=findobj(gcf,'Type','Axes');
title('');
set(s,'XLim',[-300,0],'YLim',[-60,60],'XColor',[0,0,0],'YColor',[0,0,0],'XGrid','off','YGrid','off','GridLineStyle','--','YTick',[-60 -40 -20 0 20 40 60]);
set(s.XLabel,'FontSize',12,'FontName','TimesNewRoman');
set(s.YLabel,'FontSize',12,'FontName','TimesNewRoman');
linewidth=1.5;
set(s.Children(1).Children(1),'LineWidth',linewidth,'Color','#E5AD00');
set(s.Children(1).Children(2),'LineWidth',linewidth,'Color','#7C6FAF');
set(s.Children(2).Children(2),'LineWidth',linewidth,'Color','#AA7816');
set(s.Children(3).Children(2),'LineWidth',linewidth,'Color','#EE6C1B');
set(s.Children(4).Children(2),'LineWidth',linewidth,'Color','#E02F12');
set(s.Children(5).Children(2),'LineWidth',linewidth,'Color','#75AB43');
set(s.Children(6).Children(2),'LineWidth',linewidth,'Color','#238392');
set(s.Children(7).Children(2),'LineWidth',linewidth,'Color','#0728E4');
grid on;
legend('r=3.5','r=2.5','r=1.8','r=1.4','r=1.3','r=1.2','r=0.9');

Answer 1

[Voss]

w0=300;
l1=2*w0;
l2=w0^2;
k=60;
s=tf('s');
r=[0.9,1.2,1.3,1.4,1.8,2.5,3.5];
H=figure;
for i=1:numel(r)
    transfer_function=k*(s^2+l1*s+l2)/(r(i)*s^3+r(i)*(l1+k)*s^2+(k*l1+l2)*s+k*l2);
    pzmap(transfer_function)
    hold on;
end
s=findobj(gcf,'Type','Axes');
title(s,'');
set(s,'XLim',[-300,0],'YLim',[-60,60],'XColor',[0,0,0],'YColor',[0,0,0],'GridLineStyle','--','YTick',[-60 -40 -20 0 20 40 60]);
set(s.XLabel,'FontSize',12,'FontName','TimesNewRoman');
set(s.YLabel,'FontSize',12,'FontName','TimesNewRoman');
grid(s,'on');
delete(findall(s,'Type','text'))
h = [s.Children(1).Children(1); arrayfun(@(x)x.Children(2),s.Children(1:numel(r)))];
linewidth=1.5;
set(h,'LineWidth',linewidth,{'Color'},{'#E5AD00';'#7C6FAF';'#AA7816';'#EE6C1B';'#E02F12';'#75AB43';'#238392';'#0728E4'})
legend(h(end:-1:2),"r="+r,'Location','northwest');