uSDFS | uSD File system based on ELM-CHaN generic FAT system

# using your data in dataframe df

# create s2
df['s2'] = (20*(1.1-df.arr))**3.5

fig = plt.figure(figsize=(20,12))

ax1 = fig.add_subplot(111)
ax3 = ax1.twinx()

norm = Normalize(vmin=0.95*min(df.arr), vmax=1.05*max(df.arr))

p1 = ax1.scatter(df.x, df.y1, s=20, c=df.arr, cmap='Blues_r', norm=norm, marker='x')
fig.colorbar(p1, label='arr')
p2 = ax3.scatter(df.x, df.y2, s=df.s2, c=df.arr, cmap='Reds_r', norm=norm, marker='^')
fig.colorbar(p2, label='arr')


# create the size legend for red
for x in [15, 80, 150]:
    plt.scatter([], [], c='r', alpha=1, s=x, label=str(x), marker='^')
plt.legend(loc='upper center', bbox_to_anchor=(1.23, 1), ncol=1, fancybox=True, shadow=True, title='s2')

plt.show()