Combined ASCA and SIGMA data of 1E1740.7-2942 during its standard state ( September 1993 and 1994 ) were fitted with two-phase models ( ISMBB [ 8 , 9 ] and ADAF [ 7 , 3 ] ) .
In ISMBB ’ s , the radius of the spherical hot ( T _ { e } = 150 - 200 KeV ) corona lies between 200 - 250 km where it joins the classical inner disc .
The disc radiates 40 \% of the total luminosity ( with \dot { M } = 0.017 \dot { M } _ { Edd } of 10M _ { \odot } ) .
ADAF ’ s need an extra component to reproduce the soft part of spectrum .
However , the origin of the soft excess remains somewhat uncertain , although special care was taken in the background elimination .